Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c8226a798caaf6…

MALICIOUS

PDF

67.3 KB Created: 2020-12-19 16:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a8b59849135159d0be33c2f5399ce049 SHA-1: 189e6c9f709c0017ad61721a0ae6d6c6d649519b SHA-256: c2c8226a798caaf6366c138df24c11752d20636fe189c0bb23ceeaa451b6f125
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'rational expressions'. The presence of numerous external PDF links indicates a link farm or redirection strategy. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent, likely to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://cctraff.ru/strik?utm_term=what+is+not+a+rational+expression In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_5f8daac8cd44f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485157/normal_5fac05ea7debb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_5fd824b3a7224.pdfIn PDF document text
    • https://revokaraso.weebly.com/uploads/1/3/4/3/134320841/6197660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_5fb2b71523fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_5f9a734d4234e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448727/normal_5fbae374c65b8.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/jolufozo/smash_ultimate_rom_yuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/bayers_melon_farm_market_dayton_oh.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/commandos_2_vollversion_kostenlos.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_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 4988 bytes
SHA-256: 28e875f15ab81ef29b47a651e9397fb302d94c848e0f5552f150002778e059a3
font_01_sfnt_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 10436 bytes
SHA-256: e051059c21bcacd44400dd3aa2802d12b0de41977d55b09a75ded5462e5171f0

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