Malicious PDF — malware analysis report

Static analysis result for SHA-256 c067198333a6e992…

MALICIOUS

PDF

101.2 KB Created: 2021-01-17 13:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e9d1e1f3d83722d482bb2cc65f62de8 SHA-1: dc3f2d781c414c23152c89634cd4ceb454191627 SHA-256: c067198333a6e9926f29f8414db4dace18fa9ce0d848cc792d8e339a953352c7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm containing 30 external PDF links. The ML classifier and ClamAV also identified it as a phishing trojan. The embedded URLs suggest a campaign to redirect users to a large number of other PDF documents, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/aws?utm_term=larva+cartoon+2018
    • https://rexaririwe.weebly.com/uploads/1/3/1/6/131637114/riwetumefuxu-wuwizegiluxakow.pdf
    • https://cdn.sqhk.co/pesenexur/iXOGhha/sozir.pdf
    • https://nesavelo.weebly.com/uploads/1/3/2/3/132303009/6750790.pdf
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5f8e23e8f2ee7.pdf
    • https://static.s123-cdn-static.com/uploads/4368471/normal_5ff92c64ed01b.pdf
    • https://cdn.sqhk.co/diwomijo/jVrJjhq/jaminoketasuzodu.pdf
    • https://kofenidez.weebly.com/uploads/1/3/4/8/134890612/367524.pdf
    • https://matoxidatu.weebly.com/uploads/1/3/4/6/134602194/zedazefogadi-munejof.pdf
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/172709.pdf
    • https://cdn-cms.f-static.net/uploads/4473632/normal_5fd673082a2c5.pdf
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5fae188ab923b.pdf
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/dogeze_vivuwuwowipi.pdf
    • https://cdn-cms.f-static.net/uploads/4482880/normal_5fd8cfe6542c3.pdf
    • https://cdn.sqhk.co/vivutazawi/5LSiege/26851604884.pdf
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/vuwitejanizapij.pdf
    • https://cdn-cms.f-static.net/uploads/4408195/normal_5f999d0ebdc99.pdf
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fb4301fc8975.pdf
    • https://static.s123-cdn-static.com/uploads/4420775/normal_5fc8a346732b8.pdf
    • https://taburexil.weebly.com/uploads/1/3/4/3/134374137/723865cfecc0.pdf
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/7244345.pdf
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f9591413e3e9.pdf
    • https://tizitumobupo.weebly.com/uploads/1/3/4/9/134904485/divonixekozilidizub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f0a.bin
ad12f33ed89f67cf5c0defc79723f3d4578363790e4f0f2ca2b5d173b0aeea93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 22316 bytes
font_01_sfnt_off00015058.bin
0a1db3fed5702f3c3e18727f6ccfa9c0d963d4ff62e95b8fe723f07cf93b2e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15058 5104 bytes
font_02_sfnt_off000161cd.bin
405353c19afdf2e0d668cb8153af03f667a41354658acaa4f4a273a8b1a79883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161CD 11084 bytes

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