Malicious PDF — malware analysis report

Static analysis result for SHA-256 793c79e9f9501c56…

MALICIOUS

PDF

78.9 KB Created: 2021-03-29 21:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2aa041041eb98c528c789288f750fcf SHA-1: d0fbebdc76812d89c634834ba8d0f8d8aa67d1ad SHA-256: 793c79e9f9501c56851e40dcb2531a39d34845186ba8050b50b335f688b62a89
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or SEO spam campaign, indicated by the lure text referencing a popular sale and the heuristic firing for a large number of external links. The presence of multiple external URLs, some with benign reputations and others unknown, suggests an attempt to redirect users to potentially malicious content or to manipulate search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=walmart+black+friday+sale+tv+%252488
    • https://cdn.sqhk.co/liripudeb/habpggi/cra_form_t1013e.pdf
    • https://cdn.sqhk.co/mifodirula/a8hfQij/super_jabber_jump_world_1_level_20.pdf
    • https://static.s123-cdn-static.com/uploads/4423715/normal_5fe4e488db0d6.pdf
    • https://cdn-cms.f-static.net/uploads/4381101/normal_603588122fba5.pdf
    • https://cdn.sqhk.co/kewesowovim/hgjPJie/gemikepuzejulufofaba.pdf
    • https://cdn.sqhk.co/nozujeraguje/ihrifpB/xipotefebirodosuwagoruxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://goxakimolo.epizy.com/98838183149.pdf
    • http://temekem.epizy.com/can_you_have_2_x1_dvr_boxes.pdf
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_603aaab37fc14889937ecbf8811bc1c7.pdf?index=true
    • http://dejexek.epizy.com/history_of_islam_akbar_shah_najeebabadi_english.pdf
    • https://s3.amazonaws.com/bulujono/76548902493.pdf
    • https://s3.amazonaws.com/xovajukoxin/rigifufofemubuxigoluma.pdf
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_ddf7be7bf1b64653836755e3078ef2d6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e658.bin
02489a73c3956fa9ddf7acc11aa25450fd51779aca39bde99510a5f2abeeaaf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 5552 bytes
font_01_sfnt_off0000f95a.bin
7e786c6be436d94cebce6b2652dc49500a1b02d403a38f4c86facb65f90ecbdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 11088 bytes
font_02_sfnt_off00011f43.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 4324 bytes