Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e62f90b057ed49d…

MALICIOUS

PDF

93.1 KB Created: 2021-02-07 20:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0b7767f770e3e492d289f3ec25ce192f SHA-1: 9814ae1d2abd8fdcceefe462cf272c87035299ba SHA-256: 8e62f90b057ed49d84c545e28026d85cc08b31ea111b9e7dd949f750b47a2f49
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of many suspicious URLs points towards the document's primary function of redirecting users to potentially 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://jacksth.ru/123?utm_term=paul+washer+election+plain+and+simple PDF link annotation
    • http://pedrons.space/geometry_geometric_probability_worksheetxss88.pdfIn PDF document text
    • https://sotugipuzelaj.weebly.com/uploads/1/3/0/7/130738723/2673f18b289.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/astm_cbr_test_procedure.pdfIn PDF document text
    • http://labiosdewonda.com/Kubnske_detsk_prbehyk2t39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60199d1f3348d.pdfIn PDF document text
    • http://mmamba.ru/listening_test_practice_with_answerssev9q.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/5cJAH1t/14915831862.pdfIn PDF document text
    • http://sbrf.link/19901717548lo0o.pdfIn PDF document text
    • https://rugexosijebup.weebly.com/uploads/1/3/4/0/134017508/sinefivedusolop_masino.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/1f9726edcc5.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/cRJhbij/38823186015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5fc96cee52942.pdfIn PDF document text
    • https://cdn.sqhk.co/pabulibig/QSJYjbI/50343178579.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pususarejopo.epizy.com/grey_s_anatomy_abc_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/jsdoc_template_parameter.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/chrome_portable_free_for_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/emulator_gameboy_advance_android.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 5408 bytes
SHA-256: a1ee911ab1a2fd437bfa4254bf52b68800c00154aadca2e366f5290516d99d49
font_01_sfnt_off000141d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D3 10352 bytes
SHA-256: 9360b59b0b1893e77cf3299aac9fc50b0a2f222c1ce9a76086953fffdc8d99dc

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