Malicious PDF — malware analysis report

Static analysis result for SHA-256 3daef43beeaaa970…

MALICIOUS

PDF

71.4 KB Created: 2021-01-26 03:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b77bd9be9cfa45ef995146a3144299c4 SHA-1: c5ddc3f7a90b0d62f2fcea20f194a97fa0dfffa9 SHA-256: 3daef43beeaaa970d6a966c7d7bed0904fc34f08558dcfbf0e3fdbc808f39812
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains or services like Weebly and sqhk.co, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffine.ru/123?utm_term=zegar+family+foundation+staff PDF link annotation
    • https://kibowoje.weebly.com/uploads/1/3/0/7/130775027/2737053.pdfIn PDF document text
    • https://nerutemiwuxofa.weebly.com/uploads/1/3/1/3/131398157/1857377.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/ghbicig/dental_assistant_jobs_hiring_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/ZKhdTeT/66872878666.pdfIn PDF document text
    • https://cdn.sqhk.co/wukiratuxazo/eggrgfZ/wosadumavariluvuzupaf.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/gdNnIeK/jifulemixatimisuxojoze.pdfIn PDF document text
    • http://vebejisidag.66ghz.com/tuxibifibepamorob.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/fggr87D/whispering_oaks_campground_gay.pdfIn PDF document text
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/71397.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/CuQhcwu/61498298540.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/ghO2cib/vojuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/iijg5Fn/opera_v_balet_teatr_biletl_r.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/wutezigojuxi/jubadirigepesoxafumerur.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/moxexojumi.pdfIn PDF document text
    • http://jiwimid.epizy.com/52787760516.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/76924448914.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/mixing_and_cooking_terms_crossword_answers.pdfIn PDF document text
    • http://kilaliwe.rf.gd/jeet_boss_movie.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_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 5284 bytes
SHA-256: c5c500e077f39e8a77411664d5e80395424f65c11bfadc6de173b4278395ba14
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 10732 bytes
SHA-256: 5aff380e22139314b9c6c7e050d661c7a1c3cb228fb09c7596d43a3860360f9b

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