Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76975760665f4ef…

MALICIOUS

PDF

73.9 KB Created: 2021-04-03 09:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 321222bd83ec66f65c46079b0148c499 SHA-1: b866155265cdef573b41d6f487a8214ab5520b42 SHA-256: c76975760665f4ef207e45a1f4630330b3ea6df5a312c80f840f30a29024cdcc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating a PDF link farm. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or direct users to malicious content. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=turn+on+voice+search+google+chrome
    • https://zasoliwex.weebly.com/uploads/1/3/5/3/135318241/d5f01b222b2eb.pdf
    • https://cdn.sqhk.co/motanunika/bYxhfd4/zenevoworofajotamubilom.pdf
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/b65ef20.pdf
    • https://cdn.sqhk.co/fagaxirupunu/hjUhiiq/27144551541.pdf
    • https://puzifisabu.weebly.com/uploads/1/3/1/3/131378936/1853629.pdf
    • https://cdn-cms.f-static.net/uploads/4369328/normal_60106bc47a3ea.pdf
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/70afd2f.pdf
    • https://mivagori.weebly.com/uploads/1/3/5/3/135318233/fonujal_mavup.pdf
    • https://cdn.sqhk.co/numisezopo/gfPgeIl/android_mobile_games_name_list.pdf
    • https://static.s123-cdn-static.com/uploads/4370068/normal_5ffbce32978a0.pdf
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/polonozagemedonave.pdf
    • https://cdn.sqhk.co/zetikitor/hhbhcI2/among_us_sticker_for_wastickerapps._com.pdf
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/cbdb7346a.pdf
    • https://cdn.sqhk.co/zijikunu/hgeItgc/zivigubaxejorog.pdf
    • https://dowusasetitemej.weebly.com/uploads/1/3/4/3/134307927/vefutosokofeju.pdf
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/fojesivib-mawigu.pdf
    • https://static.s123-cdn-static.com/uploads/4476757/normal_60028a3694cce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4ccc8da9-9384-447b-b67e-375f8701dd51/how_to_setup_voicemail_on_nec_phone.pdf
    • https://uploads.strikinglycdn.com/files/66b85933-344b-4d3a-8196-cf6cd09a0758/mastering_modern_calligraphy_by_molly_suber_thorpe.pdf
    • https://uploads.strikinglycdn.com/files/0533fde7-6118-4ce2-abd2-e41c6392894a/52150916774.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_off0000e265.bin
50c6baacfe3d182ab7f3b923e7db52c686c4f0d416bf76a95922ab99e946482b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 5220 bytes
font_01_sfnt_off0000f408.bin
48d345c40b5618d5b2fa9d552db1bf07eec94416b4b6176f73edf26e1d923d5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 10772 bytes

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