Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4117d1062d2e117…

MALICIOUS

PDF

89.2 KB Created: 2021-03-27 18:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6571aa1678f74cd11bf99166257a91c SHA-1: d699243a34c350821d7c60a68299652219e008b8 SHA-256: a4117d1062d2e117d1d044ca2a08a67f97e4c5783e0631a39fd01600a4f6ac74
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=module+1+quadratic+functions+1.2+answers
    • https://static.s123-cdn-static.com/uploads/4455886/normal_5fec15468790b.pdf
    • http://liwurivosopap.medianewsonline.com/93772082604.pdf
    • https://cdn.sqhk.co/nufesewepi/wigih52/lexenotexomovimuvex.pdf
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/sorugowufisiw-wapufeviputa-zewiwijogixopuk-wogugosejuv.pdf
    • http://pifadopagel.scienceontheweb.net/austempering_process.pdf
    • http://fuxanujibiz.mygamesonline.org/16282179681.pdf
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/6271682.pdf
    • http://rikafitamedad.medianewsonline.com/oakley_prescription_safety_glasses_australia.pdf
    • https://cdn.sqhk.co/nukebomevobe/jiNbHRQ/95298788671.pdf
    • https://static.s123-cdn-static.com/uploads/4413475/normal_5fffc99459862.pdf
    • https://cdn.sqhk.co/totarujined/dZgibxm/advanced_linux_commands_cheat_sheet.pdf
    • http://wijasagasipode.getenjoyment.net/dark_blue_dress_coat.pdf
    • https://cdn.sqhk.co/mekaxosur/hgdFhqF/fungi_pathogen_examples.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lumixi/can_we_whatsapp_status_of_others.pdf
    • https://s3.amazonaws.com/baposivarabuj/ben_10_3d_games_for_pc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011286.bin
3f2e81f65fc55254330e2911bfa4dece84283ac3aa10b1e63212838607597d60
pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 5456 bytes
font_01_sfnt_off00012545.bin
36db7c5f79f75e605eaafdf9161b0b63f49fba0e827a99979f2d8178a35f9fa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12545 2472 bytes
font_02_sfnt_off00012f84.bin
2af67566c46c60321d7c91d37c446f3f62f32f89b91d7ebd305c1244764cddf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F84 11196 bytes