Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85c1f700d3e899d…

MALICIOUS

PDF

70.5 KB Created: 2021-01-16 23:33:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1586f44396b7dfb6d7d57a64b141c2f6 SHA-1: 825677cae573125b366cbbe812518a80a8f321db SHA-256: d85c1f700d3e899d272fa4e8d07ba83bf749ae359e204a6b5383c9e4a6e773de
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure, such as 'traffmen.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of links and the overall heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=springboro+high+school In PDF document text
    • https://cdn.sqhk.co/wanolugago/cggR3vM/27229488759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f93dfc6402ce.pdfIn PDF document text
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/danela.pdfIn PDF document text
    • https://site-1168038.mozfiles.com/files/1168038/wevodetujuzadifipin.pdfIn PDF document text
    • https://site-1250590.mozfiles.com/files/1250590/kunilolog.pdfIn PDF document text
    • https://tapinizeguzuj.weebly.com/uploads/1/3/4/4/134456840/3518138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_5fd88d767a2cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377114/normal_5f9cf99e4e5c5.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/geAgfgi/68746436660.pdfIn PDF document text
    • https://site-1177443.mozfiles.com/files/1177443/kirikatuwazux.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/eiigdhf/idle_coins_fortune_coin_pushers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381738/normal_5fde85f4ef543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 4820 bytes
SHA-256: 92b46878ec1cfb0c65d8e70cc86258442d885814371126110d96e73e1f63ef0d
font_01_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 10896 bytes
SHA-256: c05c5e1e4d9c6f82f5031ca3ae2fcbf2973893a77747957115edb08e5b2c0d35
font_02_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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