Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6454c6261096aee…

MALICIOUS

PDF

67.2 KB Created: 2020-12-17 02:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2563ded3f04e5f4acd6f057ef8510e40 SHA-1: 1d86dd7306f9da742423068c5b3f360f454399e3 SHA-256: f6454c6261096aeeeec4bf1cccb9930b2736879ba72d20134de09474023b016d
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 operation. The presence of a URL with 'geometry+dash+30+secret+coins' in the query parameters indicates a lure to attract users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=geometry+dash+30+secret+coins
    • https://pixogujoxekame.weebly.com/uploads/1/3/4/7/134715770/sajenejuso.pdf
    • https://nutuneronasida.weebly.com/uploads/1/3/4/2/134266022/sogabutix.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/76c30d49.pdf
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/dumenesiwuviput.pdf
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5fca28768246e.pdf
    • https://bimuxafidiw.weebly.com/uploads/1/3/4/7/134701061/6ed6a.pdf
    • https://wavixupenug.weebly.com/uploads/1/3/4/3/134386336/dekap.pdf
    • https://xogaketur.weebly.com/uploads/1/3/4/5/134593565/vorokuvawiposejirag.pdf
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/d2977cf74d42.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/negonanopix/vizin.pdf
    • https://s3.amazonaws.com/fodose/sunudifijitalemowute.pdf
    • https://s3.amazonaws.com/vedexajawo/rad_ballet_grade_3_music.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_off0000c96c.bin
66f4629657d07a152d09cce724b6ec02bfaa2b8481d29920177474e05d4f8372		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 5588 bytes
font_01_sfnt_off0000dc43.bin
722e944a7b62dbc32750ee8473aa94332c39205375c5d642e7cf123da8394d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 10624 bytes

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