Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ba2869400be585…

MALICIOUS

PDF

106.3 KB Created: 2021-05-21 00:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d5479cba5674aa876af472c481b25c4 SHA-1: 7ab7a062f0e5ad2caa9bd8cbd0af78a6cb05a03d SHA-256: c1ba2869400be58596fd1df34d3e179be69bc600bf0f5ae08443ec0f3f203d9c
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 pointing to other PDFs, suggesting a link farm or phishing attempt. The primary URL, https://vilenefex.ru/strik?utm_term=zhiyun+crane+v2+user+manual, is likely part of a lure to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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-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://vilenefex.ru/strik?utm_term=zhiyun+crane+v2+user+manual
    • https://static.s123-cdn-static.com/uploads/4464852/normal_6007ba75435b3.pdf
    • https://cdn-cms.f-static.net/uploads/4404296/normal_60282f1b2505a.pdf
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fd2674ff2857.pdf
    • https://static.s123-cdn-static.com/uploads/4415046/normal_5fcf3f82c474b.pdf
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/difuwelu.pdf
    • https://jasadugo.weebly.com/uploads/1/3/5/3/135341750/2717774.pdf
    • https://static.s123-cdn-static.com/uploads/4485318/normal_5ffa78f5cd03f.pdf
    • https://cdn-cms.f-static.net/uploads/4448744/normal_604756c822ae8.pdf
    • https://static.s123-cdn-static.com/uploads/4368989/normal_5fc582ee3633f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/038e7a95-ef23-4f73-ad20-10b8db70245f/talejuretivibiwewepij.pdf
    • https://uploads.strikinglycdn.com/files/4545ca1b-d2c9-4d78-b647-3f2a772920ca/14279379145.pdf
    • https://s3.amazonaws.com/satulibaren/49712868961.pdf
    • https://uploads.strikinglycdn.com/files/925f09ad-84c8-4f57-b622-64b90a006cf4/21884071200.pdf
    • https://uploads.strikinglycdn.com/files/e1d65697-7007-4b28-b35d-6c9e3e7e60a0/craftsman_2550_pressure_washer_carburetor.pdf
    • https://s3.amazonaws.com/tajimipojimo/4959360478.pdf
    • https://s3.amazonaws.com/bolovopizonuki/93114846842.pdf
    • https://s3.amazonaws.com/tixedujegibex/2150676335.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_off0000c13e.bin
67fec2e0f98beff9a0759516570d9d3c9a13b26c82dfc1e913ad85b00798eb95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC13E 54440 bytes
font_01_sfnt_off000165cd.bin
e56fef65ba519c76d8e25ff2100b614be246c4a16bae1563d520c0e3b4e31758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165CD 5292 bytes
font_02_sfnt_off000177af.bin
d60a168efec57493cd6a91e9cf6637ba701d8e5a5c48dbde1c99ea96430e5865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177AF 10312 bytes

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