Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e768150026730a1…

MALICIOUS

PDF

90.3 KB Created: 2021-05-11 21:39:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d7f5711cb2495e795cd79ed16310b67 SHA-1: 36b12ce1075ef49a4174243ea75af76b00c81aef SHA-256: 7e768150026730a1c3e43150ee07d299f306f2ea22a28dc5d0f5775b66288c36
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, with one pointing to a suspicious domain (vilenefex.ru) that is likely used for phishing or malware distribution. The presence of embedded links suggests an attempt to redirect users to malicious sites, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wb?keyword=can%20i%20study%20for%20nclex%20in%202%20weeks
    • http://mawifit.iblogger.org/xobozutedopemosutenenatul.pdf
    • https://linajijokib.weebly.com/uploads/1/3/4/0/134000065/5099525.pdf
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/5287113.pdf
    • https://cdn.sqhk.co/jivuzukop/jVjbjeM/brain_training_programs_for_seniors.pdf
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/8406467.pdf
    • https://cdn.sqhk.co/rodofusavivi/gihbEGp/roblox_2_step_verification_not_working.pdf
    • https://pogudemuzam.weebly.com/uploads/1/3/4/0/134018755/ffeb849fa.pdf
    • https://wavamabixalovag.weebly.com/uploads/1/3/4/5/134525364/wadag-zoruli-voxisuluganog.pdf
    • https://xojovirasada.weebly.com/uploads/1/3/1/6/131637125/xitinuze.pdf
    • http://sitajejo.22web.org/79701445552.pdf
    • https://cdn.sqhk.co/pogezasamu/hjiajcX/11968528967.pdf
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/xiralenaponavon.pdf
    • https://cdn.sqhk.co/sinemajud/ahajeja/voice_recorder_free_download_for_apple.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d1b9933d-3730-4f8a-8271-6ccb15e0d6fe/2002_ford_explorer_sport_liftgate_glass_hinge.pdf
    • https://uploads.strikinglycdn.com/files/60e8939f-48d4-415c-9cb2-43cc1b26d44c/55951454642.pdf
    • https://s3.amazonaws.com/diwitapezu/12459458830.pdf
    • https://uploads.strikinglycdn.com/files/487adff6-fd33-47b7-ac59-20ec5f29efde/muxafedeligarusez.pdf
    • https://s3.amazonaws.com/vibasujefir/42561171015.pdf
    • http://sepinolet.epizy.com/lasevuwajimogefel.pdf
    • http://guzovoda.rf.gd/aschenputtel_grimm.pdf
    • https://uploads.strikinglycdn.com/files/5a6691ae-7b2e-45a2-90c0-ab2075f44d3f/meboxoloseze.pdf
    • https://uploads.strikinglycdn.com/files/176684dc-1cf2-43d3-9e34-4e3f946fc3ce/tesejikatejulu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001241f.bin
84083dbe0209b3030872d95888d7767f2c50ab4bfc11b2e8fe006e9e65cd25a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 5376 bytes
font_01_sfnt_off0001369a.bin
a88b5b36ec898856f15914c1c97efc08b90cc5bbdef393a65d04abc6be179b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1369A 10800 bytes

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