Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6bcc38c3c5396d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-16 08:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6b87b537b86c4a04b8a174d189e84996 SHA-1: 9d42bbd6789f719b57a01afbdc4b85ac1eb94b07 SHA-256: ca6bcc38c3c5396d43335a66691a670f0f72ccdfa5207f9c1baf46d5b71d4570
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://zajinet.ru/123?utm_term=alachua+county+clerk+of+court+forms PDF link annotation
    • http://pojibuvuj.mygamesonline.org/ruxuxowagusajitamukeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_6041fcb7571a5.pdfIn PDF document text
    • http://egrn-order.online/fakuxagutadituzasajhbavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_6018c769e8707.pdfIn PDF document text
    • http://viputixezererej.66ghz.com/dewetekirexiw.pdfIn PDF document text
    • https://cdn.sqhk.co/jijekabadox/njejeSu/basic_c_programming_book.pdfIn PDF document text
    • http://jelusuvobirolen.mywebcommunity.org/adeptus_mechanicus_codex_8th_vk.pdfIn PDF document text
    • http://hookup753.fun/jidibuvofapiqbat7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484636/normal_5fe2520d84b1e.pdfIn PDF document text
    • http://zdorovienashevse.xyz/bevatudoagup3.pdfIn PDF document text
    • http://teaitalis.space/processos_interativos_homem_meio_ambienteuk93t.pdfIn PDF document text
    • http://richteam.site/guided_reading_level_a_booksbk3gx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_60117f5437e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_602c84378e62a.pdfIn PDF document text
    • http://rajajime.mypressonline.com/32109748667.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/ifgeOjf/minecraft_cake_toppers_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jixojeripe.rf.gd/how_to_use_sunflower_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/lupuraxopazomemopuduwen.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/pinufesuf.pdfIn PDF document text
    • http://kozolamo.rf.gd/liver_cirrhosis_guidelines_for_management.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/tv_show_s_sites.pdfIn PDF document text
    • http://fefipunoz.rf.gd/33792788596.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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 5276 bytes
SHA-256: db6ab74d76cd0671da44206618722fcbb2b7ed90cb4e818d581b543963e1acba
font_01_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 10488 bytes
SHA-256: 88e33bcc97cce546cf280be877a82991edfa5a7aca601325e3fc7aa6166fa399

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