Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dc2d0efed7bd4f…

MALICIOUS

PDF

96.5 KB Created: 2021-01-31 03:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9a970ec32afa41300f0592ca76d59208 SHA-1: 8067e391390fb271ef742b91b479c32a9fa75859 SHA-256: 81dc2d0efed7bd4f3d3c5a0597e544326785b1c94d22d48bf8c798f6cf80611c
96 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 a high risk score. It contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to a 'guide'. No scripts were extracted, but the presence of an external URI is sufficient to infer a likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://baarspo.ru/123?utm_term=bdo+chenga+tome+guide PDF link annotation
    • https://cdn.sqhk.co/mofekuma/cMkdiiC/pixel_gun_3d_battle_royale_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_5fd234afdabd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473056/normal_6009b662f11a3.pdfIn PDF document text
    • http://vowogibex.22web.org/peppermint_beadlet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5ffbad7cce384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_600f2820294e5.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/OhjKhhQ/xotubudobovuzebazoni.pdfIn PDF document text
    • http://xosuvirakogaf.iblogger.org/digotosoritepebike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevukesamuzu.rf.gd/glow_and_grow_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/xunobupijuxevafoxak.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/zimuwezumatijuve.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/jubejurapovejiketake.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/refuxexipivizewivejojijer.pdfIn PDF document text
    • http://budunasetixap.epizy.com/15356897559.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/full_form_of_pcr_in_police_department.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/tv_listings_tonight_tv_guide.pdfIn PDF document text
    • http://pofikasuvemili.epizy.com/zegaramelerulowawipem.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 5096 bytes
SHA-256: 84f96eba340bdc5678e4a2503022253e94ec323f4ac79ef6ef7c16b295014f86
font_01_sfnt_off000136cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CD 11644 bytes
SHA-256: 5421b1ef1072081c82b6f3f33473f4120c428624957b177b6b7d1ea9ba6046ca
font_02_sfnt_off00015ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBF 16328 bytes
SHA-256: 2b5babdfc2d43053ddfbad343e2d18ac16a0b1a0946a4dc27e69f126a4283f8f

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