Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f33c29f39958f5…

MALICIOUS

PDF

76.8 KB Created: 2021-03-30 23:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f6b4ca4bfe40655d55c1f89a92aad6d8 SHA-1: f8a9b4bb6dc26404ad72a4f116ab3d48c9ed4fc6 SHA-256: 72f33c29f39958f5e402f26c9259dee76de2db4ebdb412f8ef29bee4d1fa6654
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, presenting itself as a download for a specific search query to entice users to click on numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. No scripts were extracted, but the PDF structure itself is designed to host a large number of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/award?keyword=mini+international+neuropsychiatric+interview+6.+0+pdf+download PDF link annotation
    • http://kojovud.iblogger.org/66216475928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_6016a85924de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_6035b29731b2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5fc7a1c59417d.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/hfyigif/87391310081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_6059a370ced9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416929/normal_6041565841582.pdfIn PDF document text
    • https://cdn.sqhk.co/rorijujulo/cD5p1gc/bawiruziritubufezafuzeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_603634e58b14a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_604a8fecde25d.pdfIn PDF document text
    • http://glasshookahcatering.com/mp3_juice_music_unblockedb2u9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_603aeb993a951.pdfIn PDF document text
    • http://sadovik.me/the_harlequin_heart_of_darkness_quotescsq4o.pdfIn PDF document text
    • https://cdn.sqhk.co/wokinuge/heknicX/woodworking_lumber_supply_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_10ede34009144dbb985c46b9ccdd06e8.pdf?index=trueIn PDF document text
    • http://bokatamekal.rf.gd/38916093411.pdfIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_53a6681c96a949729283ba3220ceb6c4.pdf?index=trueIn PDF document text
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_a9c4405db78f4d2dadbfdd39a523cd8f.pdf?index=trueIn PDF document text
    • http://rakemexovujepez.epizy.com/hungry_shark_hack_apk_home.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_4e2efc62cbae4c5cad0f65e344948fe0.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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 5828 bytes
SHA-256: 53904bdcc6b9d8f5d6c0062030e9e55f106138a035c48048e86c37e30f4e0670
font_01_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 10964 bytes
SHA-256: 611d0ad7ff8eeeb3030cb4cfa1fe79e10d648d45c65a85068f461c6f27a1b579

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