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) First seen: 2026-06-04
MD5: 82cb67d20281796f89eefe701c7ccfb4 SHA-1: d0176e4c1f864510b9cd6ffac83e36f45de2635f SHA-256: cd0417123a9efb051f67373263231da3186719d178daaa9c017352fb47f17c40
186 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external links, many pointing to disposable hosting services, suggesting a phishing or malicious content distribution scheme. The primary lure appears to be a fake free download of the Oxford English Dictionary. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 PDF link annotation
    • https://koximewi.weebly.com/uploads/1/3/0/7/130775363/giziwojuligonorekil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_6054da07426b0.pdfIn PDF document text
    • https://wofefewivesupas.weebly.com/uploads/1/3/5/9/135957376/4071936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5fc612c52e516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414153/normal_5fcb2ec10a757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_606d1e2ee6e09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_6065777be8ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530151/normal_6025658d8fd22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417998/normal_60243ff4e2429.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470972/normal_60b4830bdaa76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461523/normal_5ffe65a289e9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369316/normal_60066cc4e9857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_6019ac79b1c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_603e394fa0520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_605595dfa1012.pdfIn PDF document text
    • https://dasifapuzo.weebly.com/uploads/1/3/1/4/131454731/loguxizafef.pdfIn PDF document text
    • https://tukubopanix.weebly.com/uploads/1/3/4/6/134647021/puwuwazunetogen_dosorapurebepen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496580/normal_5fc9d8df97be0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_60667ce0a887d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424376/normal_606944c4213ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_60300079d8a2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1dd7e433-5c13-4796-98cb-448f86fb1d6a/m_audio_fast_track_pro_drivers_win10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25152ccd-ca13-42a0-9b23-a800f23bfb3a/can_you_buy_replacement_remote_for_roku.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 5492 bytes
SHA-256: 87a8e09121597da2b79466abae848e66dd45e1ca787598e363f4da3f3a932076
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 10888 bytes
SHA-256: f1dda36a8f28aedeb7615096940f879fabf884a9ca6f8b7a7d779a8c643d23bb
font_02_sfnt_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333