Malicious PDF — malware analysis report

Static analysis result for SHA-256 3563506bc2e25a72…

MALICIOUS

PDF

86.6 KB Created: 2021-05-11 03:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: deb10f06f623f8ff5993d7a1494c814f SHA-1: d1d7c6f05cbb5f99d8b63e25975dfe762a354657 SHA-256: 3563506bc2e25a728cfaaa7c8ab7c31fa6dd3249e3fd939614e139151cc808d7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection further indicate malicious intent. The document body, though heavily obfuscated, contains text related to downloading a Python PDF, which is likely a lure to disguise the malicious nature of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=python+programming+language+pdf+in+hindi+download PDF link annotation
    • http://fsbsiod.com/mugusavozuvupodos9oz7l.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://kazusabetife.weebly.com/uploads/1/3/5/3/135318045/713227.pdfIn PDF document text
    • https://faxilazow.weebly.com/uploads/1/3/4/7/134725206/bikedaroni.pdfIn PDF document text
    • https://mokitapakajare.weebly.com/uploads/1/3/4/8/134885173/virafan-nugupu.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/bidot-vosezumifa-setagowaw-wanalujotixo.pdfIn PDF document text
    • http://gutprod.xyz/the_book_of_enoch_mysteriesymaap.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/viniwulape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/botepawud.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/tazuzanomagunuvobosebil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e469bf86-1c38-453a-a245-1a22c9a01612/rekepumokowokiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de268259-071c-4ed8-bf3f-69c84c6776f2/70060954999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3266559-6751-4507-80fd-fc59356da180/nijizalo.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/41385877220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b3a7b96-9216-4979-8cd9-99d6672b3afd/how_to_reset_pioneer_avh-w4500nex.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_8c53a58f9d5f43bdab12d2ef553b60de.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_10c9f082e75446d788609d62edb47e76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc274705-476b-4636-a37a-5ce982a49866/what_is_advanced_analytics_services.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f125bba7-76f7-47fd-aab0-9dd4bb33b03f/binupumamizi.pdfIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_f1141ba511564a5496b322538d5b76c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2f2b49-5fdc-4a06-bd56-7204a2a0b194/pogajumaziwirifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66c32b3-cc82-4fcb-be0c-bde468010122/how_much_does_a_water_treatment_engineer_make.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/davugaratafubomaxomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4708a5eb-090b-4365-b8b7-dbd633b2ecaf/78552856735.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/rajabiziwavabewos.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_31f007fb8d77465cb134bb5ec7c7ba64.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 5472 bytes
SHA-256: 1d32a280ab9b99ac6aeeadc4427d1ea96998026b197cd95beb2b3b40b416a1b1
font_01_sfnt_off00010169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00010ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 11260 bytes
SHA-256: f80c79d091526341a91801313886575148ee22affc1fe73cc4aa9a2854ef369e
font_03_sfnt_off00013362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13362 7356 bytes
SHA-256: e883174fcb0faa7e5c913606d20f4b46d82f6083767d45eb6000d1ef25b02f40

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