Malicious PDF — malware analysis report

Static analysis result for SHA-256 051b55256d999187…

MALICIOUS

PDF

80.6 KB Created: 2021-02-27 08:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 081aaf4c5d9f2c4b0c087969b6b37b28 SHA-1: 9a75aff6b442ff487e1809b17f6b8a9e3a693045 SHA-256: 051b55256d9991876183f5b7216ae14c6bd45e2b04bf6d4bdbe6575a964e1e50
126 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 numerous embedded URLs pointing to disposable hosting and external domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to operating systems, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=tipos+de+sistema+operativo+para+computadora PDF link annotation
    • http://patajafurep.mywebcommunity.org/xezedezoxokezur.pdfIn PDF document text
    • http://thepropheticapp.com/merafugezenuremizobuzezovire7.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxobilan/YRgdie9/freeware_equalizer_windows_8._1.pdfIn PDF document text
    • https://cdn.sqhk.co/lidumezuvir/sjejFhV/8550909237.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/eigibjh/ravensburger_puzzle_1000_disney_villainous.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/6Yjjwic/world_war_ii_a_new_history.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomadu/4hfThbz/69345343338.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/nonuvefak.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/hjagije/59497587761.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/geyijG2/play_connect_the_dots_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_60278a784cb77.pdfIn PDF document text
    • http://barashik.space/41351697883jxmft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_601e37839aad4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444095/normal_5fc6aa7a5d938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470024/normal_601259dd91a44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/quadrilateral_interior_angles_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/orange_movie_naa_audio_songs.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 4972 bytes
SHA-256: ae65e7e1940e1dd143f58a6edb0a2ded8887828481eefc064e0a487a34ba3343
font_01_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 11500 bytes
SHA-256: e2e85c288310f5679344b74b1702e56881266ea65e2bbb167c11b641ce2b6f5b
font_02_sfnt_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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