Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9be4a615f460853…

MALICIOUS

PDF

83.4 KB Created: 2020-11-20 23:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e0391c72f6c50b750461bdf0916a590 SHA-1: d53a922026074fe3f2168c044a80e6d06fa3d770 SHA-256: b9be4a615f460853c5ba0a44abdc1d1ad186e2a9f1c1a600573affda7f3d6abc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/123?utm_term=jukka+nevalainen+insomnia
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/6857608.pdf
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/zilalekak-bobijopik.pdf
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5fb5b1804c894.pdf
    • https://gizarokidobibaw.weebly.com/uploads/1/3/4/3/134363860/fobututizewonog.pdf
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/manesunona_pulad_mupuzexe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wotodedaruzuk/41029749712.pdf
    • https://uploads.strikinglycdn.com/files/05f9ed2b-506d-4edf-9924-1efdb5dbdc1a/91665005382.pdf
    • https://s3.amazonaws.com/fakuguvil/tutoze.pdf
    • https://s3.amazonaws.com/lewuli/lord_fouls_bane_map.pdf
    • https://s3.amazonaws.com/pewibim/discount_tire_black_friday_sale_2019.pdf
    • https://s3.amazonaws.com/sajatesawodiji/32856172724.pdf
    • https://s3.amazonaws.com/subud/domumubutex.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e8.bin
577138063016774fcbe5f1074e8fab677274fdb93c15611ada84bdddd6cafba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 4652 bytes
font_01_sfnt_off0000f4a2.bin
d533c413b67db2141a704e52b6ef0b7ccb968d9512d21eafe86f50476a2646f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 11828 bytes
font_02_sfnt_off00011bc6.bin
f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 16144 bytes
font_03_sfnt_off000130c7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130C7 4324 bytes

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