Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0417123a9efb05…

MALICIOUS

PDF

82.5 KB Created: 2021-05-31 14:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82cb67d20281796f89eefe701c7ccfb4 SHA-1: d0176e4c1f864510b9cd6ffac83e36f45de2635f SHA-256: cd0417123a9efb051f67373263231da3186719d178daaa9c017352fb47f17c40
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm designed to improve search engine rankings for terms like 'Oxford English Dictionary PDF free download'. This is a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=oxford+english+dictionary+pdf+free+download
    • https://koximewi.weebly.com/uploads/1/3/0/7/130775363/giziwojuligonorekil.pdf
    • https://cdn-cms.f-static.net/uploads/4369332/normal_6054da07426b0.pdf
    • https://wofefewivesupas.weebly.com/uploads/1/3/5/9/135957376/4071936.pdf
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5fc612c52e516.pdf
    • https://static.s123-cdn-static.com/uploads/4414153/normal_5fcb2ec10a757.pdf
    • https://cdn-cms.f-static.net/uploads/4389108/normal_606d1e2ee6e09.pdf
    • https://cdn-cms.f-static.net/uploads/4422893/normal_6065777be8ae5.pdf
    • https://cdn-cms.f-static.net/uploads/4530151/normal_6025658d8fd22.pdf
    • https://cdn-cms.f-static.net/uploads/4417998/normal_60243ff4e2429.pdf
    • https://static.s123-cdn-static-d.com/uploads/4470972/normal_60b4830bdaa76.pdf
    • https://static.s123-cdn-static.com/uploads/4461523/normal_5ffe65a289e9f.pdf
    • https://static.s123-cdn-static.com/uploads/4369316/normal_60066cc4e9857.pdf
    • https://cdn-cms.f-static.net/uploads/4465250/normal_6019ac79b1c8b.pdf
    • https://cdn-cms.f-static.net/uploads/4418399/normal_603e394fa0520.pdf
    • https://cdn-cms.f-static.net/uploads/4378619/normal_605595dfa1012.pdf
    • https://dasifapuzo.weebly.com/uploads/1/3/1/4/131454731/loguxizafef.pdf
    • https://tukubopanix.weebly.com/uploads/1/3/4/6/134647021/puwuwazunetogen_dosorapurebepen.pdf
    • https://static.s123-cdn-static.com/uploads/4496580/normal_5fc9d8df97be0.pdf
    • https://cdn-cms.f-static.net/uploads/4453338/normal_60667ce0a887d.pdf
    • https://cdn-cms.f-static.net/uploads/4424376/normal_606944c4213ed.pdf
    • https://cdn-cms.f-static.net/uploads/4412894/normal_60300079d8a2c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1dd7e433-5c13-4796-98cb-448f86fb1d6a/m_audio_fast_track_pro_drivers_win10.pdf
    • https://uploads.strikinglycdn.com/files/25152ccd-ca13-42a0-9b23-a800f23bfb3a/can_you_buy_replacement_remote_for_roku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66e.bin
87a8e09121597da2b79466abae848e66dd45e1ca787598e363f4da3f3a932076
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 5492 bytes
font_01_sfnt_off00010935.bin
f1dda36a8f28aedeb7615096940f879fabf884a9ca6f8b7a7d779a8c643d23bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 10888 bytes
font_02_sfnt_off00012e5d.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 4324 bytes