Malicious PDF — malware analysis report

Static analysis result for SHA-256 1439e888f66ae26b…

MALICIOUS

PDF

83.9 KB Created: 2021-05-03 13:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a4fc35dc78df582eca55d3bd413412a SHA-1: e29f1cda067dd83561ba156fdad6c66b95599129 SHA-256: 1439e888f66ae26b2372d1cbc7466349fc4069933b2a2d1a06db51fa8c953723
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://leonvi.ru/strik?utm_term=regarder+z+for+zachariah+en+streaming+vf', suggests a lure related to streaming content. While no scripts were explicitly extracted, the PDF structure and the presence of many external links strongly indicate a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=regarder+z+for+zachariah+en+streaming+vf
    • https://cdn-cms.f-static.net/uploads/4370555/normal_6017227464d0e.pdf
    • https://cdn-cms.f-static.net/uploads/4389585/normal_602640987201f.pdf
    • https://cdn-cms.f-static.net/uploads/4387704/normal_600ced2f8418b.pdf
    • https://cdn-cms.f-static.net/uploads/4501027/normal_606b582be44cc.pdf
    • http://ramuwesitavoz.mywebcommunity.org/14896302939.pdf
    • http://napowojeba.medianewsonline.com/inflammatory_bowel_disease.pdf
    • https://cdn.sqhk.co/nuzinipaz/ieRNejd/cytus_alpha_gamestop.pdf
    • https://cdn-cms.f-static.net/uploads/4477138/normal_603042b2e5c74.pdf
    • https://static.s123-cdn-static.com/uploads/4465907/normal_5fce166c17fb2.pdf
    • http://xofitazuregokud.mywebcommunity.org/91797169908.pdf
    • https://cdn.sqhk.co/pefatipi/ejhnaNy/xepujojowopamadi.pdf
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/jumasitubiw-rejuvumamabaliz.pdf
    • https://zarixurumis.weebly.com/uploads/1/3/1/4/131406049/e55b21995.pdf
    • https://cdn-cms.f-static.net/uploads/4443325/normal_6009d0d5ed57f.pdf
    • https://buwuxebukiz.weebly.com/uploads/1/3/1/6/131606134/lefegulixigutaden.pdf
    • https://didegesutozixu.weebly.com/uploads/1/3/2/6/132695701/6164641.pdf
    • https://puguguduzi.weebly.com/uploads/1/3/0/7/130739618/4531633.pdf
    • https://cdn.sqhk.co/bilanogakiw/FhiNIgf/dr_panda_ice_cream_truck_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5fc96ec80776d.pdf
    • http://kikababono.mywebcommunity.org/coefficient_of_determination_example.pdf
    • https://cdn-cms.f-static.net/uploads/4374533/normal_605afe2529a68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b225707a-c950-4e7a-a956-28b4fa0f64ff/rekuparexeru.pdf
    • https://uploads.strikinglycdn.com/files/56221872-a19c-4f24-8e29-8bb3d34b8b15/rijanitipejuvidazariwa.pdf
    • http://doriponesarom.myartsonline.com/cell_organelles_and_their_functions_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/4fd64be5-51b6-48c3-9824-e0480ff3e96f/zagogagerot.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_off0001018e.bin
8a22f7f3574213d914e618a9027dd41547c5f607949161cc4f1259ebe5750451		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 5520 bytes
font_01_sfnt_off00011445.bin
e99f31b41781a56941f7a6c9669eae6cf7c13f52159c1a353d73192bf40990af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 13792 bytes

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