Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4da7d96f5a37184…

MALICIOUS

PDF

70.7 KB Created: 2021-04-03 01:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: afd2dc251d584982fffaf433996e7a6a SHA-1: dfcfe385dacd46f9ad136915cb765fcc1c6b4b69 SHA-256: d4da7d96f5a371841a8c460454b790a1e8684b9e1b28f2cdb0313eedbc999da3
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 pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of a link farm on disposable hosting, suggesting a lure to external malicious sites.

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://jacksth.ru/123?utm_term=org.+apache.+commons.+collections.+collectionutils+jar PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374954/normal_5fc7f490515eb.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/1932306831.pdfIn PDF document text
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/7466250.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/88601253008.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/47536975536.pdfIn PDF document text
    • http://sinomefonok.mywebcommunity.org/3809650470.pdfIn PDF document text
    • http://duwuzoruperiged.scienceontheweb.net/are_ohio_death_certificates_public_record.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/1797004.pdfIn PDF document text
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/2880671.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/bumodanimuvivupemajofafu.pdfIn PDF document text
    • https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/tefimaven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_605d876e7c2e6.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/adriano_zumbo_cookbook.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/lofese/jagepuwedidi.pdfIn PDF document text
    • http://padegijogul.atwebpages.com/bobina_de_tesla_funcionamiento.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/titegamoziveladuleta.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/council_bluffs_iowa_crime_reports.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_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 5480 bytes
SHA-256: 29847366375d01a8ee348ba7bef1555c858725b0e69a09c8723196cd3ae0d080
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 9944 bytes
SHA-256: c90401b9fccf977881d16d7a3304de72136afb87e093274ca840cc79ec04e988

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