Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0238f7e537ebac…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 20:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3396d550f44617d25d2e1ba10e8a118e SHA-1: 1dc7b829b5e6173a5de7173423cccac8aa43f24a SHA-256: bc0238f7e537ebacbb5b2fde198f329bba85adc235935f9b1cda4259ef10c881
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. The PDF contains a large number of external links, suggesting a link farm or a mechanism to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=mouse+guard+roleplaying+game+pdf
    • https://cdn.sqhk.co/wodelaganav/cTwz6It/64478245764.pdf
    • https://cdn-cms.f-static.net/uploads/4504047/normal_60354f60cca30.pdf
    • https://takupomowemeb.weebly.com/uploads/1/3/5/3/135314116/katemitem_fibakumerebi.pdf
    • https://cdn-cms.f-static.net/uploads/4385635/normal_5fdb51dab7db5.pdf
    • https://cdn-cms.f-static.net/uploads/4453729/normal_6043f4d39f933.pdf
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/9b2099545.pdf
    • https://cdn-cms.f-static.net/uploads/4446045/normal_5fe699aa92a3e.pdf
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5fee9c88c426a.pdf
    • https://cdn.sqhk.co/fetuxudo/cIoie4x/57281364314.pdf
    • https://cdn-cms.f-static.net/uploads/4418984/normal_602050be43559.pdf
    • https://cdn-cms.f-static.net/uploads/4370265/normal_6029a88009e9d.pdf
    • https://cdn-cms.f-static.net/uploads/4484610/normal_6010d7709a04e.pdf
    • https://pakakisokuz.weebly.com/uploads/1/3/1/3/131381756/93b3064b193.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suxorodefis.epizy.com/nikadubitodope.pdf
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_96c2c87e628947fcb0b2f23fd588eaba.pdf?index=true
    • http://bujidijig.rf.gd/20617034873.pdf
    • http://kinisijemutow.epizy.com/what_is_a_field_operations_specialist.pdf
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_926b4833a4624a0f93c83f7f8e2e7872.pdf?index=true
    • http://parubowigul.epizy.com/kinovifapuvakawed.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ce.bin
1c2478d70984c6cd9f81e52472c7e79e4a42e797ec72422b59013e688195dd9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 5468 bytes
font_01_sfnt_off00010569.bin
7c063c12ce3ba7509587109444fcfe7c25d31e5a42801774fe8cc56018b91f26
pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 13428 bytes