Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb46e96b3bb2df2…

MALICIOUS

PDF

73.0 KB Created: 2021-02-19 23:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 282590f4ae04a7d8d09ea4eefc793ca8 SHA-1: 576158bcdd26914318cc544378f4fb45115157f9 SHA-256: dcb46e96b3bb2df29559ca3fa382fc98ac31d8747576df175470b24aae6ae3e4
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 external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection infrastructure. The document body, though heavily obfuscated, appears to be a lure related to test answers, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=systems+of+linear+equations+and+inequalities+test+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fcfb03b685d8.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/gjirNge/mutisevusonulo.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/jaGibgc/gumball_watterson_voice_actor_2019.pdfIn PDF document text
    • http://winnerslm.space/walexememapikulezinudu9nt7c.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/ib4YAjH/13775189042.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/igssEdu/wevirevajitezojusixigoke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454040/normal_5ff7600d21173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_601afd9896cad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_602143cd4db94.pdfIn PDF document text
    • http://cmbclientes.com/nakubigidabanasezlvq0.pdfIn PDF document text
    • http://zuwujamoruwipam.22web.org/7385719256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_601eb645a9fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_600e69edb747c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448536/normal_5ffb3ae41056e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fdfb7f53cb26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_602f44cd174e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://temekem.epizy.com/advanced_english_dictionary_and_thesaurus_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/marvel_encyclopedia_free.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/melogatixapo.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/metformin_vs_glibenclamide.pdfIn PDF document text
    • http://daduzafez.epizy.com/stand_by_me_lyrics_spanish.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_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 5476 bytes
SHA-256: bb6024248754b2a8cac63a289b5006da068d624c870a1f11ccbbc565c674f485
font_01_sfnt_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 10948 bytes
SHA-256: 436ba808daca651f4587f2a521f12565f57ed9f1247a56fe7aa5b436fd491c60
font_02_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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