Malicious PDF — malware analysis report

Static analysis result for SHA-256 148414dd4dc2afff…

MALICIOUS

PDF

69.9 KB Created: 2021-05-16 13:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cf7d2c2066982ea35d8e2904ba77b496 SHA-1: 194d0f227245c3c65088129ff038481f3079b344 SHA-256: 148414dd4dc2afff9b94d3dfdb3ca29654b9a9e7f35d567aa1cc80e3d1818bf5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

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://crophysi.ru/strik?utm_term=why+is+printer+printing+blurry PDF link annotation
    • https://cdn.sqhk.co/zikufojigox/Swia8hg/antibiotic_prophylaxis_guidelines_canada.pdfIn PDF document text
    • http://safetymirrors.xyz/75959910731t3tj6.pdfIn PDF document text
    • http://ceter.xyz/rulogasevghqwq.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/N1lhija/brick_breaker_world_champion_mod_apk.pdfIn PDF document text
    • http://carinsusa.com/xuberotomupusumarv9ejh.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/tezasevimab/cJk5hDg/47557949429.pdfIn PDF document text
    • http://antonioita.fun/89812067472ly1zv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_606cb726b3136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427085/normal_600833e8887bd.pdfIn PDF document text
    • http://forpost-electrica.ru/1018009904241xw2.pdfIn PDF document text
    • http://chempion.coffee/table_tennis_racket_bag_priceyaw9r.pdfIn PDF document text
    • http://llloooodddd.space/mageperunupejan0qccz.pdfIn PDF document text
    • http://daddytestit.xyz/kitchenaid_coffee_grinder_partsk71rr.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_2805af4a1db14393afde071900a257c5.pdf?index=trueIn PDF document text
    • https://764dfaed-7091-4b1c-a8ff-ceb5b694923f.filesusr.com/ugd/4bafdb_d39faf4276a149b29b973efbec50e896.pdf?index=trueIn PDF document text
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_34e2128774764f93a8981be39856f334.pdf?index=trueIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_28fc11ca8c6242a4973519d03544116f.pdf?index=trueIn 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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 5128 bytes
SHA-256: 8ca170de01ffb6e4997ff091c793ecbf90ab547a71331ac682a2be768eb8ee9c
font_01_sfnt_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 10220 bytes
SHA-256: 7edbb26894fea2010051105cb10304b12bd701d72ef1eef771b0d86ed302aba2

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