Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ddbfaa1af5e488…

MALICIOUS

PDF

78.2 KB Created: 2021-03-25 15:18:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e73bcf51106cdb34ee7cbff8ac52c1b5 SHA-1: 9ff7be49b4d601a69dcc5aebda2740477794481c SHA-256: f1ddbfaa1af5e48879094e92adfb7165e71c74d1d2bf518b7770a713132eea67
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/wix?keyword=chapter+7+assessment+chemistry+answers PDF link annotation
    • https://cdn.sqhk.co/posogamumut/hqGie4c/baxutenufa.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/dadilagofeteferuj.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/dapunaseweso.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/6w4XvMl/wokudewaxupoj.pdfIn PDF document text
    • https://ruzoriro.weebly.com/uploads/1/3/5/9/135975417/8493654.pdfIn PDF document text
    • https://sonefexezeripu.weebly.com/uploads/1/3/0/7/130739000/4830623.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/fghQjeM/radha_krishna_tv_serial_photos_hd.pdfIn PDF document text
    • http://babarogumo.iblogger.org/96170559771.pdfIn PDF document text
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/607420.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kubazemaxem.epizy.com/15800840206.pdfIn PDF document text
    • http://puximonivafozij.epizy.com/wosudixarugero.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_0840068e2549493da74b2bc4979cd6f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/womirofop/pefuxedewirolofofifuwide.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/40599473166.pdfIn PDF document text
    • http://benevelolimeb.epizy.com/can_adobe_reader_xi_edit.pdfIn PDF document text
    • http://lomonogugala.epizy.com/lithic_analysis_odell.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_4de29de9f7874815973060081bb3a8bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firudegix/arbor_acres_broiler_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 5320 bytes
SHA-256: 4c162fed80547d2034b47684ecc686c15ec00bf34ba7b7a90a2f7ca7532b821c
font_01_sfnt_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 10708 bytes
SHA-256: d4214168f4d4eaceba74a74ff68aaef717c57d24e70f99f9135b18f6e42de7c2
font_02_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 16080 bytes
SHA-256: a1bdc24ec6dc0332449754d26803ee00bb6717469f64a18f47c680e22104396b

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