Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1640181f6cbdd1…

MALICIOUS

PDF

104.0 KB Created: 2021-05-26 02:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8b50d62600fab5792dfc18df741be13f SHA-1: 788fe13d185b08594c23f3208d0223361d619b94 SHA-256: ff1640181f6cbdd1afb29d6b50ca71ef945d8d8306e8a5cb5721bc75e67e2716
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links pointing to various domains, including one that appears to be a redirector. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports the malicious nature of this file. No scripts were extracted, but the overall structure and link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://jacksth.ru/strik?utm_term=rameshwar+sir+economics+notes+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366031/normal_6000b7c88c6cc.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/540256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_605fbac01a56b.pdfIn PDF document text
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/fileporef-kowotifox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_600f57b4a8455.pdfIn PDF document text
    • https://vidasukesidi.weebly.com/uploads/1/3/4/7/134731400/gijas.pdfIn PDF document text
    • https://lobusuzagoti.weebly.com/uploads/1/3/4/4/134470260/mikedebomevudija.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/kujesulad/dirobisaxudifitid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250474f2-36a7-4283-a3e8-c5088da4f889/cfa_syllabus_level_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769473e4-9235-4207-bca7-b0e511bc4744/how_to_seal_corners_of_garage_door.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f39fff-99ec-4eca-9866-7d4a42de6c7e/vezivox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08442d0c-6862-446c-a3a7-b870d0df7ca3/how_to_clean_dyson_dc50_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e5097e-a859-4d91-9b49-aa577fb37fc5/13980498714.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/88446807393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0918d22b-b715-4a69-b234-81f0203a6e0b/agno3_nh3_c_hin_tng_g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d578a2-52d8-43ee-8c9b-dbe5dbcef4c2/4284197085.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/oster_blender_6_cup_glass_jar_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/lotus_notes_8._5_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4b8efd-a9bf-4282-8c05-596c62338825/lord_of_the_rings_book_review_common_sense_media.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d2adc1-b1c8-421c-b95a-18323ba2bf06/sijipenopepukafel.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/porusi.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 5280 bytes
SHA-256: e929193bea8041bd69f0120d5668ba57114b973b0a3e101f4581ea8fee514c4c
font_01_sfnt_off0001103c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 3776 bytes
SHA-256: 905b8a25dcefa93e9e6460b22936e52fd3501d0fe34fc97c0bfd279302d94999
font_03_sfnt_off00012a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4B 12108 bytes
SHA-256: 1d0e74ae22ef2ec711e0c96b33b68d28e2831811601c7a1af4005a9bf5129647
font_04_sfnt_off000152b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
font_05_sfnt_off000160b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B8 15396 bytes
SHA-256: 92e5058dbafb6d587ba2ff76cf5f728416c5b7e755fa87b7ab78db10b84c2a27

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