Malicious PDF — malware analysis report

Static analysis result for SHA-256 d134b74d710672fd…

MALICIOUS

PDF

82.9 KB Created: 2021-03-10 16:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e9b880a219720dba8254052165a39a9 SHA-1: 7e99e733a5475d4edbd4a2268e25c6a14ade76f8 SHA-256: d134b74d710672fda47dcee558ad3e7c3b7b8ff71e27c90b1591d1f648e0d274
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites or download further payloads.

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://jumiwimov.ru/award?keyword=chemistry+apparatus+list+pdf
    • https://roviselazadavuw.weebly.com/uploads/1/3/4/0/134040559/0455d6bd8ce9.pdf
    • https://bojurejid.weebly.com/uploads/1/3/4/8/134887271/3ad76fb9e6f380.pdf
    • https://weduparazibad.weebly.com/uploads/1/3/4/7/134710999/7792963.pdf
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/wugove.pdf
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/f0586aec52f1f61.pdf
    • https://dilopapavi.weebly.com/uploads/1/3/4/7/134705518/e0b939796ea1fc7.pdf
    • https://cdn-cms.f-static.net/uploads/4388271/normal_6034c1b56bc9a.pdf
    • https://cdn-cms.f-static.net/uploads/4383156/normal_601db3b71236a.pdf
    • https://damajarulapo.weebly.com/uploads/1/3/0/7/130738748/gojeziradobux.pdf
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5fe35d01874d1.pdf
    • http://liketime.fun/49548599530zf1qt.pdf
    • http://zilofunawoson.iblogger.org/probability_and_statistics_lecture_notes.pdf
    • https://bewirupudafa.weebly.com/uploads/1/3/1/6/131607000/bufedajuratam_zonak_pilaketa_damudefugi.pdf
    • http://repair-telefonov.ru/1762483495471bgv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/libowebujakux/dajadixefiwosinedamuz.pdf
    • https://s3.amazonaws.com/tugabijenovili/xeluvakawurukutake.pdf
    • http://zizumanoxiv.epizy.com/55877646850.pdf
    • http://deredizupuvibuz.epizy.com/digepabidixegi.pdf
    • https://s3.amazonaws.com/muvazi/90879222424.pdf
    • http://xiramegakasivi.epizy.com/67086709014.pdf
    • http://puxakuxuvon.epizy.com/jbl_flip_3_waterproof_rating.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_off00010649.bin
25a11ab7967b440eb667f980a18556649b259b61a738c3e210a52f5a0aaea1fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 5288 bytes
font_01_sfnt_off0001181d.bin
aaf6551b7266ccf09123d5fdaa8d387328c93767eb3d6162f04d2762195d77f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 11400 bytes

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