Malicious PDF — malware analysis report

Static analysis result for SHA-256 c475953ea91dadcc…

MALICIOUS

PDF

78.8 KB Created: 2021-03-03 16:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4d2aa44cb4c4a92bf9e2b88de940d2d5 SHA-1: a043d32337ad26b66a3bf6ec2bdc88ea67f6e87b SHA-256: c475953ea91dadcc5d9e5dd5be11780f3e83e77a764ce6c0c760f7c17f7ca333
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to distribute malicious content or conduct phishing. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=integration+of+cos%255E5+x+dx PDF link annotation
    • http://mbfsopg.com/alien_vs_pinball_mod_full_apkebloh.pdfIn PDF document text
    • http://alkostore.xyz/xozodujo1xu76.pdfIn PDF document text
    • http://1eyvgo.xyz/how_to_use_adjective_in_spanish1u0mx.pdfIn PDF document text
    • http://magicwoolshop.com/where_can_i_donate_used_childrens_toysy8cyd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482020/normal_6000b24fc64e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_603362b5609a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_60081cc1a0af0.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/gorajep.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/vabepekujitetogefini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_602ac01344ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459788/normal_5fe94f3acd42f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_602ad04055513.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/laferavudokanejuborotuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_6019ce25a9928.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/veg_recipe_of_india_chilli_paneer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5feff41b88973.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijedan.atwebpages.com/16110552166.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE97 3040 bytes
SHA-256: 2e0406d255433b7eebed61740af08eeac889f34a8ac1216fd4a6af0e74f6f423
font_01_sfnt_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 5336 bytes
SHA-256: ceed4669924cc2d83ebe4dd360ed24853b59966964fccb1a6be148183ceae771
font_02_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 13448 bytes
SHA-256: 9c586d6dbe8751fb9628612eb7632a831f9688e6b484acb0b46143374f47d110
font_03_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 16080 bytes
SHA-256: ce6c9a31222968989703f653af24ef420cae08753b095152a9eff5d9cedd60e7

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