Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ce9e667e1d1b1a…

MALICIOUS

PDF

62.4 KB Created: 2020-11-21 17:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 272ed5ecd439d1122f97ab85cce63580 SHA-1: 74640c960e94556953af92f1a6932bb1263fde56 SHA-256: 27ce9e667e1d1b1a460e36abb46fc7215ff24ebbae4009b276d84290e7126e98
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://trafftec.ru/123?utm_term=el+ser+y+la+nada+jean+paul+sartre+pdf+descargar
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5fa5ecf552f4a.pdf
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f9d0ac9f2d4a.pdf
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5f89a479b80f3.pdf
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/8e3800c.pdf
    • https://cdn-cms.f-static.net/uploads/4407780/normal_5f95369deeada.pdf
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5fa2f8d817c8c.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/43c1ba5f.pdf
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5f8b988947cd5.pdf
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/vilagonapik-muvoveworoj.pdf
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f8a5a1932929.pdf
    • https://tuvomirunasoz.weebly.com/uploads/1/3/4/3/134324776/jikeza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000b442.bin
e8a0c32e9395408676f27ab521a876ea08fac078a04a8be048d9f1414fb40c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB442 5456 bytes
font_01_sfnt_off0000c6f4.bin
9e93720a507120e56d45121ab4d3b94eed9d6f793e7756d19f6d9d7975a57cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 10888 bytes

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