Malicious PDF — malware analysis report

Static analysis result for SHA-256 74423e2545f0ce5c…

MALICIOUS

PDF

76.1 KB Created: 2021-02-21 17:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d0e557b146e67a1200c8310daa052032 SHA-1: 1a7d904ea2da685d05d5d45cc36a0f95130bd417 SHA-256: 74423e2545f0ce5c0dd56c42b80f911be6a83eac1ae6c86b36d3e58b21cd1c0d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a health topic, likely to entice clicks on the embedded malicious links.

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://seumenha.ru/strik?utm_term=can+intercourse+cause+cervical+cancer PDF link annotation
    • http://xiwogukonefem.iblogger.org/construction_line_logo_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_600a0e13e0714.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/fpHjixu/viridiana_alatriste_como_murio.pdfIn PDF document text
    • https://cdn.sqhk.co/zoturisa/rj9ihcy/ball_bounce_and_sport_dallas_tx.pdfIn PDF document text
    • http://axecheat8.xyz/how_to_turn_on_emerson_led_tv_without_remote13v9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_600ffce711eb6.pdfIn PDF document text
    • http://cheatyou.site/65044370758mvbe5.pdfIn PDF document text
    • http://homebig.space/patching_system_image_unconditionally_xdah8weh.pdfIn PDF document text
    • https://cdn.sqhk.co/fidakasari/giibpgd/devijuneguxerodebolulu.pdfIn PDF document text
    • http://wekifojedopike.22web.org/how_to_treat_metabolic_acidosis_in_neonates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446770/normal_5fdd6a57153b8.pdfIn PDF document text
    • http://neojust.ru/kinds_of_sentences_according_to_structure_worksheet_with_answers9sp2l.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/aiddD1Z/pirates_dice_game_pirates_caribbean.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/nate_the_great_series.pdfIn PDF document text
    • http://tadulizejemopo.epizy.com/22781338343.pdfIn PDF document text
    • http://pilulozames.epizy.com/17987101732.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/alphabet_worksheets_for_lkg.pdfIn PDF document text
    • http://puwowega.epizy.com/2nd_grade_math_standards_virginia.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_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 4756 bytes
SHA-256: 71d8fc63118f3b1687375f48e15167588430607d386c780a37880076a0dc7839
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 10696 bytes
SHA-256: fbb1e5411e641ceeb934b20926feae093a232213cd5bba4090f477113e5d4665

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