Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2cae944e10b932…

MALICIOUS

PDF

75.1 KB Created: 2021-01-28 10:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c62852b3e7555de55a20791499789488 SHA-1: c3e357154dbf6874b864be8816999469fe0fd17e SHA-256: be2cae944e10b93272b9ba1d5619d3ce75909b05b3148521e261dc9a5c900d23
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://leonvi.ru/aws?utm_term=acanthophora+muscoides+pdf
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/3525b6b1.pdf
    • https://mipafalubered.weebly.com/uploads/1/3/4/0/134017716/ce59d24e761308.pdf
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/sinuluvulisapaj.pdf
    • https://cdn.sqhk.co/jogekiluse/tAKjhdN/17256938496.pdf
    • https://cdn.sqhk.co/tufuboloruj/jguphcf/stickman_fight_dragon_legends_battle.pdf
    • https://cdn.sqhk.co/xazewizol/hdNghgc/83515360721.pdf
    • https://cdn.sqhk.co/daxozazon/jljcxvu/free_printable_calendar_templates_2020_september.pdf
    • https://cdn.sqhk.co/fuwifemi/3sTCn3y/xbox_one_console_cyber_monday_2020.pdf
    • http://saxamem.iblogger.org/gro_snug_dressing_guide.pdf
    • https://pogudemuzam.weebly.com/uploads/1/3/4/0/134018755/7377329.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zebarufuridorur/59276088147.pdf
    • http://repeputowuz.epizy.com/arjun_classes_physics_notes.pdf
    • https://s3.amazonaws.com/gadumagabusodel/63413922822.pdf
    • https://s3.amazonaws.com/xafaxotaful/graphing_quadratic_inequalities_in_two_variables_worksheet.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/xipodusobuxigolaziviwu.pdf
    • https://s3.amazonaws.com/kizugokofo/creativity_test_questions_and_answers.pdf
    • http://jemibare.epizy.com/bipagelota.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_off0000e4bc.bin
450f255dd32fa1f55a92025fce1639a610d2dc4ccf879e94716ebad51cf1fa71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 5352 bytes
font_01_sfnt_off0000f6ca.bin
849bc4d0830d0c325084a6587888ee86c8856fd41bbf7259483eda2deb77b7d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 12188 bytes

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