Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f1a280280bbe4e…

MALICIOUS

PDF

88.2 KB Created: 2021-03-31 03:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 64d07b21afc2010bc2d4e39130cf8378 SHA-1: 7a55b78f2814dde231efad897df515bc364042e2 SHA-256: 86f1a280280bbe4e1d07a42a71042949b2dbfd68503c3b606a900b1980938b20
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to malicious websites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/award?keyword=androgenos+y+antiandrogenos+pdf PDF link annotation
    • https://cdn.sqhk.co/xufatirumina/jhgifb7/86942576691.pdfIn PDF document text
    • https://cdn.sqhk.co/miweguzeg/gdjj5ih/pulinige.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/4d6051fdd11.pdfIn PDF document text
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/1d93569f7e69.pdfIn PDF document text
    • https://cdn.sqhk.co/tipadasa/jghb0ha/hssc_laboratory_attendant_answer_key_morning_shift.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dikumetuvo.epizy.com/xawirimida.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/ragox.pdfIn PDF document text
    • http://kukejisagev.epizy.com/28360758064.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/what_is_the_structure_of_a_compare_and_contrast_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/kugamamafuf.pdfIn PDF document text
    • http://duronudisibap.rf.gd/an_apology_for_poetry_full_text.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/photodiode_amplifiers.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/zubopeletoj.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/chaser_2013_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/espen_guidelines_enteral_nutrition_critical_care.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/abrsm_grade_5_theory_paper.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_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 5268 bytes
SHA-256: f5f16b517dacf96621eae20b629ce61553f0bcbe17f91a510f0175fdb0283e79
font_01_sfnt_off0001158b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158B 12340 bytes
SHA-256: dad1c92564c30894674cb9fd9a6078617b12ac9b8ec88ea7e2e9d481cea2fe74
font_02_sfnt_off00013de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE7 16312 bytes
SHA-256: 2ef632aad644e71e450025a127afc1949af5203e449914ac71728310b7604956

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