Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a35ea2ccbe78c41…

MALICIOUS

PDF

73.0 KB Created: 2021-03-09 08:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0d7294f1068b10194d06c277bdfde36c SHA-1: 1c73dd75e098902ddaffc6ac2facc5a34f12274a SHA-256: 7a35ea2ccbe78c41d8f0d2adc59169f44fe208201abc3e9ef9483e14fe2e72f1
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL, https://maypoin.ru/strik?utm_term=how+to+get+the+bobbin+thread+to+catch, is the primary indicator of malicious intent, likely leading to a phishing or malware download site. No scripts were extracted, but the PDF structure and external links suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=how+to+get+the+bobbin+thread+to+catch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410204/normal_6024201f43181.pdfIn PDF document text
    • http://ig-mediateam.net/daxaferegabuwulugiloz2p86.pdfIn PDF document text
    • http://lyudi23.ru/gisutilixesiwamebikbikg9.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/Xgjgihi/company_of_heroes_movie_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464052/normal_5ff7a4201f7e6.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/jfijXhd/motorola_flip_phones_at_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/jXjRDSz/lixorijaxajaj.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/fjeaXjf/xewepepij.pdfIn PDF document text
    • http://parralax.net/sezelemazoditonuxbfs2.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/jhivig8/37482497372.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/xovavoderizan75zl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_60293ca763562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_a86f8965085a43acaa66119ab2360caa.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_05d2883546a74e21aeca8edaabc93e9d.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_20916258670540338745e31b9d595254.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_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 5184 bytes
SHA-256: fb115fa6fd105f38856a68db85591e8097cd4212afc25eec8a4b04f6e84fcd46
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 10128 bytes
SHA-256: 9702fe7f9b8741672c0fbd5035b98fdd8849a8979cacf1831ea2b8b6dd3d5e82

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