Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ec01f6ba17fe34…

MALICIOUS

PDF

72.5 KB Created: 2020-12-20 20:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b61c14a759fa89ddd91f8152b147f388 SHA-1: d4407708bccca2f5fc12ce511fe4013135a36d84 SHA-256: 43ec01f6ba17fe3450034c728e9ef3c6d3de2b06e632400e44e907821f08cbc1
186 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 hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://traffine.ru/strik?utm_term=dash+diet+tracker+1200+calories', are likely used to redirect users to malicious sites or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/strik?utm_term=dash+diet+tracker+1200+calories
    • https://cdn-cms.f-static.net/uploads/4385612/normal_5f98d699a5df4.pdf
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/4458275.pdf
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/1009114.pdf
    • https://gukozorupo.weebly.com/uploads/1/3/1/4/131411088/tunufetirixinat.pdf
    • https://cdn-cms.f-static.net/uploads/4409799/normal_5fa30d86ad24e.pdf
    • https://roderisagewap.weebly.com/uploads/1/3/4/5/134507489/6614568.pdf
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/voduwigef_vasowi_rimomupemu.pdf
    • https://mizeximo.weebly.com/uploads/1/3/4/2/134265944/kenunaxidixila-xewafeguxumasig-rixifibexeza.pdf
    • https://cdn-cms.f-static.net/uploads/4444110/normal_5f9e16aacc147.pdf
    • https://static.s123-cdn-static.com/uploads/4387219/normal_5fc8b1b37a351.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tenunud/wimovikadibafuno.pdf
    • https://static1.squarespace.com/static/5fc30859ab79f442f23780a8/t/5fc8dd2792e74531f3d6297c/1606999335387/cartoon_boing_sound_effect.pdf
    • https://s3.amazonaws.com/tabobujimo/fuxapagakimusamebiju.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_off0000df9c.bin
c9502c23f1db79e040f1b66488dbf46aa30ca10bf26f0d2e82c020374cd01d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 5416 bytes
font_01_sfnt_off0000f206.bin
681d3f5d4142ed1fb5866a27dcd46e69c233e2854e5b32828cafa4ecf5e53128		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 10384 bytes

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