Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ac3362d0603e19…

MALICIOUS

PDF

81.3 KB Created: 2021-02-21 15:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4710baf747169c65d50a214432f28e69 SHA-1: dba1e1565faaf581065b801e2a030b5eb63acc1b SHA-256: f4ac3362d0603e19831b7dd9e94e8b8879b690cde594d0b906d5cfd7e2146bf6
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including brand-impersonation credential phishing for Amazon. It contains numerous external URIs and redirects, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bozobazevadetob.weebly.com/uploads/1/3/1/6/131607158/kiduwipodafedepif.pdf.
  • 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://seumenha.ru/strik?utm_term=the+wim+hof+method+activate+your+full+human+potential+pdf+free PDF link annotation
    • https://cdn.sqhk.co/lewoxiguj/hDgeid5/54610002450.pdfIn PDF document text
    • https://cdn.sqhk.co/zixagiko/xjijehc/prison_break_season_4_cast_list.pdfIn PDF document text
    • https://bozobazevadetob.weebly.com/uploads/1/3/1/6/131607158/kiduwipodafedepif.pdfIn PDF document text
    • http://wigomufeze.22web.org/guided_meditation_deep_relaxation_5_minutes.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/ahhZgjs/bifubiderax.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/ghZ3e9a/batevariguged.pdfIn PDF document text
    • https://cdn.sqhk.co/nofoxanu/bjjYgEN/88889226812.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/higLQX0/71976701901.pdfIn PDF document text
    • http://dugules.iblogger.org/dobazivudedirunubuni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/t_reporter_c_ngha_l_g.pdfIn PDF document text
    • http://xugejaf.rf.gd/logo_arsenal_dream_league_soccer_2018.pdfIn PDF document text
    • http://govakuvi.epizy.com/34398869796.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/zemikerowurinodafinuluv.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/riding_breeches_size_guide.pdfIn PDF document text
    • http://witeguxatuzidaj.epizy.com/new_sankarabharanam_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 5420 bytes
SHA-256: 33fe1f1cc632be7569ac8751238d8bfb129c73da8b3ad85864d9b2e11bd496ea
font_01_sfnt_off00011207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11207 11120 bytes
SHA-256: e9ca0dcfd0412b083f09a137973524132ca53add82d41fb2de18d94594a1d3cb

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