Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c3b522f782c160…

MALICIOUS

PDF

77.4 KB Created: 2021-01-29 07:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 619ce4f85b631599254eea6b2d81c729 SHA-1: b37bc93e723104774f286c8f21cdf7fda61fafaa SHA-256: 42c3b522f782c1607d75f75cd638a1ecbb01391762379c132fc4bbb58558aa24
156 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 ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or distribution network. The primary external URI points to 'seumenha.ru', which is likely part of the attack infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=cinnamon+girl+sheet+music+lana+del+rey
    • https://pulogumofus.weebly.com/uploads/1/3/0/7/130739416/5830408.pdf
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/251731.pdf
    • https://cdn.sqhk.co/wefegiwezon/KENjj7I/63440541493.pdf
    • https://cdn.sqhk.co/zuvifilezaja/SHwIHii/the_best_ice_hockey_player_in_the_world.pdf
    • https://limifotediko.weebly.com/uploads/1/3/5/3/135325738/jubekuludu-jogusimugunila-tizajabugipiwo-lokokowo.pdf
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/muwibulewe.pdf
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/5347061.pdf
    • https://vogapixafaroge.weebly.com/uploads/1/3/4/2/134234717/66b18c16c0.pdf
    • http://healsmall.space/word_search_printable_large_print6d2o1.pdf
    • http://hookup158.fun/162951606017oa3v.pdf
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/8ca1f278136c6f.pdf
    • https://cdn.sqhk.co/palubavuz/eigC8ib/5569975726.pdf
    • https://cdn.sqhk.co/jiguluzufuwa/1nkhdjh/27491373049.pdf
    • http://zunugopubudo.22web.org/49399136216.pdf
    • http://my-favshopg.online/fedoxatakakubixirimamekencwglo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nupopejif.epizy.com/966108558.pdf
    • http://fopopuwefepa.rf.gd/titosujul.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_off0000ee4f.bin
580cb9da1a138b644d09f349bf648c4452fc4454dfe79393429c6a51baef5fc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 5360 bytes
font_01_sfnt_off00010061.bin
5dbfbaad8be6148072650a81dad9655a4f19b2263c308bb4f75c59245de2def1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 11236 bytes