Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a863ba02cd9363…

MALICIOUS

PDF

86.5 KB Created: 2020-11-10 12:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 462410a92ef5d9039bbdb4f018428996 SHA-1: e668337796233ef751387e4d3d13c3599d1a9844 SHA-256: a4a863ba02cd9363f649de5796d91a38217b9ce9d7161abfd4ba098a827ca173
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many pointing to PDF files hosted on CDNs and other platforms, suggesting a link farm or SEO spam tactic. One prominent URL, 'https://traffset.ru/strik?keyword=nordictrack+exp+1000x+manual', indicates a lure related to a treadmill manual. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?keyword=nordictrack+exp+1000x+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378165/normal_5f96864b58c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_5fa9077cb0f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f8b2d391973c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5f95cfbb26a9f.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/6018413.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/7355566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_5f9e2445a1eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f91aec659d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f87ad74ea1f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467030/normal_5fa51c55e97a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403422/normal_5f926fb5d6272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/castlevania_3_nes_rom_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/zoxoranibupemisemelove.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_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 2972 bytes
SHA-256: 508955ceb1a861b62fccf92f840279c9a777a16d4839bfd9e630937738d47edd
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 5336 bytes
SHA-256: 7a446a02463b9b34bb669aab6144d309c621460d6aec36b982a4f4cc0ee2619d
font_02_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 14192 bytes
SHA-256: aaf26af2fcac9e4d538024c1ae17fe639133161ebcbacdd44b05bcb77f9fb6ec

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