Malicious PDF — malware analysis report

Static analysis result for SHA-256 71226e8f21e27970…

MALICIOUS

PDF

84.8 KB Created: 2020-12-25 06:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: aa2408c26fca7e99cd5b5676787274c7 SHA-1: 73bb18081b74a8282e1fa6ee1f7b4e33b1de5dff SHA-256: 71226e8f21e279702e728c60a24fb531a10fc08b08475135391e314344063ea9
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, which is a common tactic for SEO manipulation or distributing malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=carbonic+acid+formed+by PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393019/normal_5f8eb1a6ca26b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5fd5fb9642655.pdfIn PDF document text
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/3024167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f98e1c5b9d5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414353/normal_5fcc3ae919596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_5fa6aa67d22f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_5fdc1a3a566b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ecc6bba-85bb-46bd-b17a-3c83c1c8c368/belkin_thunderbolt_3_express_dock_hd_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/probability_mass_function_vs.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 5104 bytes
SHA-256: 010723cc48b1e8b894ee964202a93300f652d45fc8a02cd3024db51b7ef47ba0
font_01_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 12676 bytes
SHA-256: 753a23648f12415a6b1faec29bf2317208fedf4848e5b8b4cff502964361230c
font_02_sfnt_off000131d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D6 16116 bytes
SHA-256: 202a30011041adb925c63395aea5723fdd705f12d81b5fb95af3d17ec96e0d02

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