Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c436e5e9e110500…

MALICIOUS

PDF

79.2 KB Created: 2021-02-27 05:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5484791d2edae658235e64eb02e9ab5e SHA-1: b78df24ff56580b94db3d042fd4c9d158e1fa91e SHA-256: 4c436e5e9e110500210473e0046b9f587786fda6001e36e96b489d53273dea65
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is designed as a link farm on disposable hosting, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=husqvarna+rz4623+deck+leveling PDF link annotation
    • https://cdn.sqhk.co/gefimiwotux/cggMuic/13220941898.pdfIn PDF document text
    • http://fruit-ital.space/performance_appraisal_process_hr5w2sc.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/ghanhfk/the_turner_insurance_advisor_group_inc.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/bd3WguX/3_tamil_movie_background_music_ringtones.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/45093355245.pdfIn PDF document text
    • https://cdn.sqhk.co/wukatigubo/vjgzkie/garlic_smashed_potatoes_crispy.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/69913627473.pdfIn PDF document text
    • http://teenagetutor.net/atletismo_pruebas_de_campo1futb.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/hcksahb/8456659373.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/Wjiiagd/52793959138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_60336f8c57594.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/strength_training_anatomy_workout_3.pdfIn PDF document text
    • http://fruit-ital.space/rancher_55_carb_settingshwqwx.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/zIMjdjg/jezubolodubupiliwepinez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_600d242d1a67e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417423/normal_5ff1add7304ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_600c9cd45f106.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/iihHgjO/81063615443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sesoxevanadike.epizy.com/40793997413.pdfIn PDF document text
    • http://livugaxoretedop.epizy.com/format_number_to_2_digits_javascript.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 5904 bytes
SHA-256: f0c672506738055508944960bb3a73afabc81dc9718acc9c775d983c29edcafd
font_01_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 12172 bytes
SHA-256: 4c54ea9575ad5deca8df29f645db3df143f817945720d778c4ca8ed10b49fc43

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