Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c667d0bffa3a611…

MALICIOUS

PDF

64.4 KB Created: 2021-02-24 11:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ba3a6596c286671929ce3b0ec1437e46 SHA-1: daffbf3b9cc8e499cde7e233ac93300da22e217f SHA-256: 6c667d0bffa3a611cd8cd5c9f582501af477084b08c86b11d5a4ed31e5fba638
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of links to external PDF files hosted on disposable domains, suggesting it functions as a link farm. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection indicate a malicious intent, likely to distribute malware or engage in phishing. The presence of a URL with a 'utm_term' parameter suggests a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://yafferge.ru/strik?utm_term=filtrete+3m+thermostat+low+battery In PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/doduverudunaj_vepexatel_pasoxi_xagedufirit.pdfIn PDF document text
    • https://tofesozexeraj.weebly.com/uploads/1/3/4/6/134610570/deguzarogeku-sesubeloxujudof.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/74d2b4bb2648ef4.pdfIn PDF document text
    • https://jofovumilaj.weebly.com/uploads/1/3/2/6/132681264/7798853.pdfIn PDF document text
    • http://hookup154.fun/rejifaloxanjitwl.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/khaiygh/39051574636.pdfIn PDF document text
    • http://summ-green.fun/51353903973xuxr0.pdfIn PDF document text
    • https://zikowetaxubof.weebly.com/uploads/1/3/4/0/134012945/jipatalav.pdfIn PDF document text
    • http://lg-copyright.com/bisesatibasomeld98d.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/hz1agj4/stickman_rope_hero_2_old_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_602f90f0db999.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/hfgijaZ/surgery_master_game_spleen_removal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_600c03913bd71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422386/normal_5fcf7d0b6152a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_5fd2850dcde99.pdfIn PDF document text
    • http://get3creditscores.info/62421033760nt1r2.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/radubozufiwo/africa_competitiveness_report_2015.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_off0000bab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB7 5380 bytes
SHA-256: b8383b477cd1a4800b4a7784e831484da16d1dcb0f30e2c1aac1cad3f4b02da6
font_01_sfnt_off0000cced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCED 12312 bytes
SHA-256: 134b9d5d732d048547f82c8891a1bacf30a5a6c0a0103965c6b8f33401e03a72

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