Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a18ca84e9c603a7…

MALICIOUS

PDF

73.4 KB Created: 2021-02-17 20:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32c2dc7eda97cb6600034e5c1001bd22 SHA-1: ba8ebe29294b81cddf4fd0e1ef6983982db72a3d SHA-256: 5a18ca84e9c603a7a6aa2af6abee45a568e190f09ef3ac11d91cad3d42f29072
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, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=which+is+the+best+blood+pressure+monitor+for+home+use
    • https://vudujetejagug.weebly.com/uploads/1/3/4/6/134674723/vajutuwerulik.pdf
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/623739.pdf
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/lojikodar.pdf
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/f0a05.pdf
    • http://vekvelo.ru/frp_bypass_apk_android_7._0_nougatbhdtl.pdf
    • https://tuzopukerokep.weebly.com/uploads/1/3/5/3/135347688/rodexolepajasi-punesebosiba-gefadugavositab-gudil.pdf
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/cab2022e7be87.pdf
    • https://static.s123-cdn-static.com/uploads/4384825/normal_5ff58ae6cc007.pdf
    • https://jabifuvos.weebly.com/uploads/1/3/1/0/131070291/piwirula.pdf
    • https://jibogikufojubu.weebly.com/uploads/1/3/1/4/131438018/40d31a671e.pdf
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5fe4360646cef.pdf
    • http://myluckybet.xyz/warrior_cats_spottedleafs_heartnlyut.pdf
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/kugidajivose.pdf
    • https://fotavimapuwe.weebly.com/uploads/1/3/2/8/132816041/f9b2891060112.pdf
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/gijutilukewadobop.pdf
    • https://static.s123-cdn-static.com/uploads/4369763/normal_5ff5f8e21e0ad.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19d.bin
3b8d183846d7f590d7aea2a88f6223803dad613a03426d47f5096e6f78a89184
pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 5340 bytes
font_01_sfnt_off0000f3a8.bin
bb4353ea1d7b634f749dfb168bd63f60237eae55e1f815ccc39de8452f54df5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 10668 bytes