Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbab08ddc81f6d4…

MALICIOUS

PDF

94.6 KB Created: 2021-05-28 05:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdd2b6a5d1c7f588d9d2eeb89837023a SHA-1: 66cac0f32fa6998d1468447c2f84dc5d58309cb3 SHA-256: 5fbab08ddc81f6d4ccab015bcdacdc968972052408f80f40e31d8cddd965be2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to lead the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nipisod.ru/strik?utm_term=should+i+buy+apple+watch+5+or+wait+for+6
    • https://cdn-cms.f-static.net/uploads/4384029/normal_606c8fb5a929f.pdf
    • https://static.s123-cdn-static.com/uploads/4456377/normal_5ff75eed06415.pdf
    • https://tatojevukud.weebly.com/uploads/1/3/7/5/137508330/tijojikedibe.pdf
    • https://gibejuta.weebly.com/uploads/1/3/0/7/130776113/2858582.pdf
    • https://cdn-cms.f-static.net/uploads/4409819/normal_60610905595e1.pdf
    • https://wezedamuj.weebly.com/uploads/1/3/4/4/134480618/d768ad8f.pdf
    • https://cdn-cms.f-static.net/uploads/4381551/normal_605ddfecd6593.pdf
    • https://sefezepijimife.weebly.com/uploads/1/3/4/7/134733313/17d63d52281b18.pdf
    • https://vafumesaz.weebly.com/uploads/1/3/4/5/134589630/tagesowidasorev-zubaxopufo-muxopexavej-vaxinamilipu.pdf
    • https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/fa9537e44e.pdf
    • https://static.s123-cdn-static.com/uploads/4459776/normal_5ff1d67c2c084.pdf
    • https://dubezotamepaloj.weebly.com/uploads/1/3/5/2/135297843/8b685d.pdf
    • https://cdn-cms.f-static.net/uploads/4419626/normal_6046243cd372c.pdf
    • https://wipaluxeko.weebly.com/uploads/1/3/4/3/134346688/6623079.pdf
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/3426897.pdf
    • https://cdn-cms.f-static.net/uploads/4459796/normal_6031cdaa54eb2.pdf
    • https://static.s123-cdn-static.com/uploads/4478688/normal_5ff39bd741999.pdf
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6027e5b25c626.pdf
    • https://cdn-cms.f-static.net/uploads/4412181/normal_60176da050e77.pdf
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5fd1e0f014c2a.pdf
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/ff1d2ed.pdf
    • https://mezuxanivatanid.weebly.com/uploads/1/3/4/4/134499991/9325220.pdf
    • https://vajepagipe.weebly.com/uploads/1/3/4/0/134000011/feteza.pdf
    • https://cdn-cms.f-static.net/uploads/4450042/normal_60445a6ba2cd6.pdf
    • https://cdn-cms.f-static.net/uploads/4485568/normal_606929296da61.pdf
    • https://cdn-cms.f-static.net/uploads/4366029/normal_604b9a38a88f7.pdf
    • https://golurivuj.weebly.com/uploads/1/3/4/7/134744385/e8d8eb31.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f46.bin
2d8e743e22325dd19dc2f13c5b714f816ed392c2a74132d15be2c3c42da44ce8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F46 5780 bytes
font_01_sfnt_off00014304.bin
5cb53b6f44e81d8f949839a94ae187e33a6b78c0e94879f6f60f75cb76b62897
pdf-font-stream PDF embedded font (sfnt) at offset 0x14304 12524 bytes