Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98f658d76a0e4e4…

MALICIOUS

PDF

66.0 KB Created: 2020-11-11 23:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 679ff16462b7ac24e1d8071589e1d818 SHA-1: 994be54f2b981ea7a776f34b750a47b3e18077e9 SHA-256: f98f658d76a0e4e49f166b0fad312f1771633e9116790e895497d19c341971d3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm or phishing operation. The primary malicious URL identified is trafffe.ru. ClamAV also detected this file as Pdf.Phishing.Trojan, reinforcing the phishing classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=oce+error+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5f9a5fab55f56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f93d2dd01060.pdfIn PDF document text
    • https://fineruliji.weebly.com/uploads/1/3/4/3/134313455/salazivenodef_tegajebote.pdfIn PDF document text
    • https://pomudada.weebly.com/uploads/1/3/4/3/134382041/puminok.pdfIn PDF document text
    • https://sesizapilutib.weebly.com/uploads/1/3/4/2/134266568/dedefip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f870fd4a8291.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/radaruropivoje/26391920972.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/milaca_unclaimed_freight_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/rakonezum/effects_of_sugar_binge.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/school_tool_csd.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/organic_field_corn.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B2 4720 bytes
SHA-256: be339e0bf3016312b5f108c1babf2f29ee94eb2eb18b150419d1e8985243d1ed
font_01_sfnt_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 10800 bytes
SHA-256: 35a72600c21c397959939a63070684ec031e7fdf8faab6b4448782c801514231