Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef576483be73a704…

MALICIOUS

PDF

63.7 KB Created: 2020-12-24 03:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf14eecfb8ce6ad4a8a10d74cb64ab0 SHA-1: 1e51c99ecc81d949b59899c72086bca3ba6b976f SHA-256: ef576483be73a7040c644c27f5fc52873ed30ab9e7464a338b1f8c77cb5343a0
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious sites, likely for credential harvesting or further payload delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=truth+tables+worksheet
    • https://cdn.sqhk.co/gozolosew/6jhrG0N/yousician_an_award_winning_music_education_app.pdf
    • https://sajenaviwabawi.weebly.com/uploads/1/3/4/2/134266368/fonuno-lasigi-nipokojugorigad.pdf
    • https://cdn.sqhk.co/nosuterib/dRigtzh/27154169690.pdf
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/vidabudivodeduwokobu.pdf
    • https://ravadekivis.weebly.com/uploads/1/3/4/5/134512786/puroka.pdf
    • https://cdn.sqhk.co/xubenijevewe/Whbibhj/zisowozizatebowinilik.pdf
    • https://gudosotavuna.weebly.com/uploads/1/3/4/7/134722070/konevifi.pdf
    • https://cdn.sqhk.co/letowajaf/msicjjb/mega_ramp_stunts_master_speed_boat_racing_games.pdf
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/bavokix-wupowexedepen-xetivujemi-lavulojawe.pdf
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f95447824339.pdf
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/eddb305d54b3.pdf
    • https://vafuzetok.weebly.com/uploads/1/3/2/7/132740798/bosaja-kawidinuzowo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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_off0000b3d3.bin
74ba8968d0218281116969434aac1d8611b0404f17aa9d784da23cef776f7a79
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D3 4744 bytes
font_01_sfnt_off0000c41e.bin
ff6b6b899c8a4a7cf95f43f8406863ea2b8c669f40a321d1e8467018e6904bc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC41E 9496 bytes
font_02_sfnt_off0000e422.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 4324 bytes