Malicious PDF — malware analysis report

Static analysis result for SHA-256 246847d2e1094abd…

MALICIOUS

PDF

80.4 KB Created: 2021-03-20 16:04:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 036ccbf481b9f1fcd8b6887a0c9cbaca SHA-1: e21dccf45d38d8e4a8b67a1e73500027a9ad0ec7 SHA-256: 246847d2e1094abd255db5e3ff20f476cfdeb0bb36c19a18beb2f848183695b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm, and is flagged by ML classifiers and ClamAV as malicious. The embedded URLs likely lead to malicious content or phishing sites, aiming to trick users into downloading further payloads or revealing sensitive information. The document body, though heavily obfuscated, suggests a lure related to a veterinary neurology book.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=livro+de+neurologia+veterinaria+pdf
    • https://jimekijan.weebly.com/uploads/1/3/2/8/132815057/31475.pdf
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/kolebisijutimepa.pdf
    • https://static.s123-cdn-static.com/uploads/4476146/normal_600936dd4e43a.pdf
    • https://kozinawesi.weebly.com/uploads/1/3/3/9/133997283/4e6657bf34.pdf
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/xixup-vuvuxopedasuful.pdf
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/7cf8e.pdf
    • https://cdn-cms.f-static.net/uploads/4375909/normal_605266aad6198.pdf
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/dezikasunip.pdf
    • https://pofewapat.weebly.com/uploads/1/3/4/0/134018592/2518184.pdf
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5fc860d6c26c4.pdf
    • https://cdn-cms.f-static.net/uploads/4426066/normal_600f79f22470c.pdf
    • https://vedaputenada.weebly.com/uploads/1/3/5/3/135318287/6869150.pdf
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/7210846.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/694d8369-a140-4cb7-8e25-9c1e0477df8b/fujifilm_finepix_s8600_review.pdf
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_292e28aa5bf0463a9fd8add1c6a4ee95.pdf?index=true
    • https://b27aca93-056c-4dd2-83a6-fd909c9f709d.filesusr.com/ugd/2ba3ac_6a599fa89e674904a353ffe914d4a711.pdf?index=true
    • https://uploads.strikinglycdn.com/files/00545e3b-7fa9-4478-b7bd-c8b847af30c3/past_perfect_simple_tense_exercises_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/beb02a9c-01e9-4dc9-9e4a-d21b1906f1a8/diastasis_recti_exercises_during_pregnancy.pdf
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_d2f53311d8c9436aba0aa48a678df3c2.pdf?index=true
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_62ffed68693c4acba30e44fcc6f50b5c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/73b55099-1501-4d9e-bbb0-756a2bcae990/dell_latitude_e6510_battery_light_flashing_orange.pdf
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_2d6aefaca75a448eb56f20134552ceb2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd24.bin
b9d21e7d599da1ad516e3e2525443b7bc656662dc7e7ab3e64c8ee75c30c48a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 5032 bytes
font_01_sfnt_off00010e64.bin
56b8d3fd97e6304f4db89d9b8add627e43f38319eaf190357bc7c7a7041d0347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 13668 bytes

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