Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f4c346bfa54a21…

MALICIOUS

PDF

80.8 KB Created: 2021-03-27 14:19:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4335408277c8f8b9a5f928ba29d08a85 SHA-1: dc5a341f5630a38df16b7e43ec2cf19964615f27 SHA-256: 29f4c346bfa54a21d293daeaff29a5e7a0dfcacd4f4d70ee30f1eec255833a27
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a link farm heuristic, suggesting an attempt to drive traffic to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL and the PDF_SEO_LINK_FARM heuristic point towards the primary goal of redirecting users to external sites for further compromise.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=biogas+from+animal+waste+plant+design+project+pdf
    • https://zefivevolexu.weebly.com/uploads/1/3/1/6/131637056/0dabb5.pdf
    • https://static.s123-cdn-static.com/uploads/4367279/normal_5ffc54f3bf57c.pdf
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/778113.pdf
    • https://cdn-cms.f-static.net/uploads/4486534/normal_601ebe640a010.pdf
    • http://mozujana.22web.org/dendrobium_orchid_care.pdf
    • https://static.s123-cdn-static.com/uploads/4446260/normal_5fdf6a5f8d482.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/runuzitexokol/vowaxovodone.pdf
    • https://s3.amazonaws.com/jobavo/84029651857.pdf
    • https://s3.amazonaws.com/dazuxujepov/25236933722.pdf
    • https://uploads.strikinglycdn.com/files/c31419f5-c2fd-4325-9d58-99068ac945db/82607480436.pdf
    • https://s3.amazonaws.com/pipaneku/breathitt_county_ky_occupational_tax_form.pdf
    • http://redebalumu.rf.gd/blankets_craig_thompson.pdf
    • https://s3.amazonaws.com/pujirageg/how_to_rig_a_spinning_rod_for_trout.pdf
    • https://uploads.strikinglycdn.com/files/2d659fa2-5718-4321-a917-ae3991badf52/77185879445.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc8.bin
7eba294635241c624ed2e8d24ebc68aeb7aa4ecdbcc0e4001e06b4d79ef93db3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 5692 bytes
font_01_sfnt_off00010f2f.bin
7256542fd06db9034cf147b405e66b46f9a09d7ebd46f8d24eb918a3736670a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 11512 bytes