Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cf30b824c0d7ae…

MALICIOUS

PDF

71.6 KB Created: 2021-04-02 01:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fc751315c38b71c60485a8b6c86b87a SHA-1: 1ad64089aead29e69280d1ce270fb0043906a0eb SHA-256: 39cf30b824c0d7aeda6aff1899ced8930e7a3207e6107b7f4b6cee78a38e72e4
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'golowaki.ru', which is likely part of the attack chain. The document body, though heavily obfuscated, suggests a lure related to 'book answers', further supporting a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=un+ete+pas+comme+les+autres+book+answers
    • http://jadebey-x.com/16084489561frbkh.pdf
    • https://cdn.sqhk.co/noneniwetav/ahficaC/memenuwof.pdf
    • http://poverkavoda.website/55136051966um2qt.pdf
    • https://cdn.sqhk.co/girewobo/87oMnjb/determination_of_drilling_mud_density_lab_report.pdf
    • http://esportzmlevent.com/1502057387k9vcu.pdf
    • http://naturmilans.fun/serajibuzodulajazw87nf.pdf
    • https://cdn.sqhk.co/pojimisuso/cjdjaih/guess_the_disney_movie_character.pdf
    • http://ukranews.icu/navekopeke580my.pdf
    • http://jobs-ingenieur.best/48326180621bjzsw.pdf
    • https://cdn.sqhk.co/vojofarakiva/dhgYnhg/football_player_daughter_dies_during_game.pdf
    • http://bachanalytics.com/46452937292elk7r.pdf
    • https://cdn.sqhk.co/lewoxiguj/hdheQJT/cheap_indoor_paintball_near_me.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mokixetat/45021873312.pdf
    • https://s3.amazonaws.com/mozedijiz/ye_bhagwa_rang_hd_video.pdf
    • https://s3.amazonaws.com/metakibeme/literal_equations_examples_worksheet.pdf
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_0c47d6ef79094b9590866be9f1368a56.pdf?index=true
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_739229e5799c42edacdf5a0bffa03ef5.pdf?index=true
    • https://s3.amazonaws.com/bupesejirijejus/lujimesig.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_e60e22b66e20491cabf6ddb60e4191aa.pdf?index=true
    • https://s3.amazonaws.com/nawuvud/best_certificate_design_software_free.pdf
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_44c367f665f449f68c69311fb2da78b6.pdf?index=true
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_36b67c17c8d34c6cabcfe15408916f01.pdf?index=true
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_64bde195832244b59bd0c73e9099c007.pdf?index=true
    • 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_off0000daa3.bin
a2b18e212c97904c5bccb8b748519b75a367c0cb413f6b5326ee731269c21f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 5368 bytes
font_01_sfnt_off0000ecdb.bin
95b73528c1121c1a155cb70760e8962654a648ad81a83f62d89e2c021f060e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 10264 bytes

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