Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f9f0685f32275f…

MALICIOUS

PDF

100.4 KB Created: 2021-03-25 18:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d39e702cefbcea4da6e1641160d8a2b0 SHA-1: 1621aade2a6280199822e80e0e5ea404600e8797 SHA-256: 01f9f0685f32275f9dea8c73b170f5359d163a9d8266ce91d65ba87fa39daf8c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gimoguvi.ru/123?utm_term=sign+nsfas+online+loan+agreement+form PDF link annotation
    • https://neweruruxoponi.weebly.com/uploads/1/3/1/4/131453136/9e1819c90872.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483604/normal_5ffa3090b9c3e.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/pabakutebizet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601ad3802f610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_5feaff7e3e222.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/cifgggf/gilezumulazulojuxafozaw.pdfIn PDF document text
    • https://cdn.sqhk.co/xisofofumew/h83iaws/royal_family_news_tragedy.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/ja1Fjjb/zujapigiraludowus.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/3068697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_604b9c3c89aa4.pdfIn PDF document text
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/gidipaxazipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_600c4a47c76a8.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/6db200503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/14017032-b59b-424a-9844-cceebf9050c3/repirijisolakorizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160bc50b-9f5f-4130-9500-a082bf7756f5/how_to_cook_country_style_ribs_in_stove_top_pressure_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e14e0c-922f-43c3-a57c-527438ddd6ff/54406518318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ed6df4-bf0f-44f8-b1aa-4d80e57fd627/36528041655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44960a69-87e3-4658-b6a2-79642261c92e/vusinek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db8b85a9-5d77-420b-8232-59d5b04d3919/votefugazasoxagekososono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe1e8e1-be75-4f47-b9ff-21bdd28e832f/4379733167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02bf574-972b-4818-9907-5cb360e344b1/how_the_grinch_stole_christmas_2018_soundtrack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4541e8b1-bdbd-4cb1-9de7-7b6d60f9c426/jexanusiwimagidukeninug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ddbeb0-7f68-401e-967c-c9990838f06f/41669494968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87920f8-bdb9-467c-a8d3-1874eb91552d/lenovo_g50-45_wifi_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b33e488-84ed-4ba6-a3a1-3af6bdeb88f1/taco_bell_veggie_power_bowl_calories.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13649 5188 bytes
SHA-256: 48c1eddac18850d7482e7ee0e3dafd3d456fb468a7d1b579ae7dc632db8fee5f
font_01_sfnt_off000147da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DA 11512 bytes
SHA-256: f14708c6cafcd310858835c5624e41ae0f8fc71f4726f5b9574dfcdcc0c4d7f0
font_02_sfnt_off00016ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED8 16076 bytes
SHA-256: df8916dc0488248139c8b7f8575cdad52201066875df9eb3f38f8be7ce625b0f