Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8494d7ccf4b22a7…

MALICIOUS

PDF

83.6 KB Created: 2021-05-29 08:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9309935ad4f8de7d5223266e5227f87a SHA-1: b3582f75d60fb4f63f873630b6c8a2431446b801 SHA-256: e8494d7ccf4b22a705902949162393d94fa480fa36ba30217217a2591d883c69
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

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://zajinet.ru/strik?utm_term=exercices+factorisation+5%25C3%25A8me+pdf
    • https://cdn-cms.f-static.net/uploads/4370270/normal_603e2a0334988.pdf
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/7949872.pdf
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/jawebu.pdf
    • https://static.s123-cdn-static.com/uploads/4388815/normal_5fcf5ac8ce3d1.pdf
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/wezezovukutiz_xazowa.pdf
    • https://kabuvegezukab.weebly.com/uploads/1/3/5/3/135325093/rokulefeda.pdf
    • https://cdn-cms.f-static.net/uploads/4382790/normal_6017c36f454c4.pdf
    • https://cdn-cms.f-static.net/uploads/4417405/normal_6018a0f2a4505.pdf
    • https://cdn-cms.f-static.net/uploads/4413987/normal_5fdace7233ac3.pdf
    • https://cdn-cms.f-static.net/uploads/4425759/normal_606e741351dd7.pdf
    • https://cdn-cms.f-static.net/uploads/4450628/normal_605d1fb09b3c1.pdf
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6037fb08d610d.pdf
    • https://cdn-cms.f-static.net/uploads/4447447/normal_602bec3a92c56.pdf
    • https://leburivirabilaz.weebly.com/uploads/1/3/1/4/131453170/605e30281.pdf
    • https://wuwemupijebuvat.weebly.com/uploads/1/3/4/0/134012408/4325834.pdf
    • https://kizuwapeputatu.weebly.com/uploads/1/3/4/3/134375201/7114790.pdf
    • https://duzinalanidik.weebly.com/uploads/1/3/4/7/134760416/8497569.pdf
    • https://cdn-cms.f-static.net/uploads/4417659/normal_600c8979a48bc.pdf
    • https://tisexazom.weebly.com/uploads/1/3/2/6/132682329/7ec561e.pdf
    • https://cdn-cms.f-static.net/uploads/4478670/normal_6056d27c5901f.pdf
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/sotudefakizotunotag.pdf
    • https://xoxazibazosilex.weebly.com/uploads/1/3/4/5/134590820/wudotaluzavi.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_off00010322.bin
a8394797255a0ccf25afeb43ccb5fca7fb2bf8cb9c3856ec56fbfa6ae8779fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 5560 bytes
font_01_sfnt_off000115bf.bin
be780c0c416af63ab908a293cf01efa8414b2acedcfae0ffed6478393e4be488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 12656 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.