Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec317404c3612d71…

MALICIOUS

PDF

76.7 KB Created: 2021-05-22 09:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba22650459afb3571d6f5f4592ffb6e6 SHA-1: 29df27470b9b02bf3f9ad91e51f3f2bd852afec6 SHA-256: ec317404c3612d71afe1859e03e5b3f07fe7d1579430af5c43cef891f2677fb3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1203 Exploitation for Client Execution

This PDF document was flagged by ClamAV as a phishing trojan. It contains numerous external links, some of which point to other PDFs, suggesting a link farm or distribution network. Crucially, it includes a 'Clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for downloading and executing secondary payloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://kuzutuzo.ru/strik?utm_term=create+azure+storage+account+using+arm+template
    • https://static.s123-cdn-static.com/uploads/4383571/normal_6006d10ddc102.pdf
    • https://linowatudevenur.weebly.com/uploads/1/3/4/5/134599813/kizima.pdf
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/zanagumerejej-sopupa-kifogupenixoj.pdf
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/pixipagukeg-wiwos-guvamaborog.pdf
    • https://teleroxekafi.weebly.com/uploads/1/3/5/3/135321942/roxed.pdf
    • https://dilimeriju.weebly.com/uploads/1/3/5/3/135351787/6542988.pdf
    • https://static.s123-cdn-static.com/uploads/4369518/normal_5fff9e5d8166d.pdf
    • https://cdn-cms.f-static.net/uploads/4412584/normal_602513fc257e7.pdf
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/b2c2b153617a1.pdf
    • https://bakusiluvusefe.weebly.com/uploads/1/3/5/3/135309983/41dd39.pdf
    • https://cdn-cms.f-static.net/uploads/4485442/normal_5fd79e2738d84.pdf
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/pizadaserumo.pdf
    • https://xigowobil.weebly.com/uploads/1/3/4/6/134645495/rirulipij_xenumolure_zovigami.pdf
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/b7a803d05621.pdf
    • https://jerewerek.weebly.com/uploads/1/3/5/3/135349205/b76ced690cbe89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bivanud/corporate_social_responsibility_csr_refers_to_the.pdf
    • https://uploads.strikinglycdn.com/files/c460966c-f636-402e-b50e-c390d7efe890/stephen_king_first_edition_price_guide.pdf
    • https://s3.amazonaws.com/pukiza/dodogel.pdf
    • https://uploads.strikinglycdn.com/files/c2272a60-0bdd-4ad6-a38d-65ceb3722a08/vonoga.pdf
    • https://s3.amazonaws.com/wulotugadag/piriformis_muscle_treatment.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec16.bin
bb584778e465d55b7922ffbb3bb8de0dbebc6ad05f6e930237b06b569e222b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 5208 bytes
font_01_sfnt_off0000fdbc.bin
34cbd3dc756b6d4b9ed3a5b5007182d1e37bbb171282eadccffc1016207e86c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 11560 bytes

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