Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37aa11595223d42…

MALICIOUS

PDF

77.0 KB Created: 2021-03-30 23:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e449ed3ee8ddb852115fc9090585c03 SHA-1: eca13424a22c6149b126088fd609951f0f0d0019 SHA-256: f37aa11595223d4213e7c3100e83c8f066a51e4b1a1f8772f0b9e81a65bcac2e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=advanced+computational+fluid+and+aerodynamics+tucker+pdf
    • https://cdn.sqhk.co/bejomewuv/jaXZwWl/walking_dead_no_man_s_land_mission_guide.pdf
    • https://cdn.sqhk.co/teketerep/Yicshcs/xopipovu.pdf
    • https://girusetobar.weebly.com/uploads/1/3/1/0/131071114/kukiget_demofepumageji_kumasokavofer.pdf
    • https://cdn.sqhk.co/zizenozi/PGijjeu/vibivusazidixoxowu.pdf
    • https://dukagalirizaz.weebly.com/uploads/1/3/1/8/131856141/kaxenivojogalefubu.pdf
    • https://cdn.sqhk.co/neratimo/gjigNMD/75234281466.pdf
    • https://cdn.sqhk.co/sewadokoka/gfhciju/neon_drive_switch.pdf
    • https://cdn.sqhk.co/bagudivibi/lbgeXjh/71152127970.pdf
    • https://cdn.sqhk.co/xonipavu/jbc8B9K/magic_poser_pro_apk_download.pdf
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/cd0f762d2bf.pdf
    • https://zebilukirun.weebly.com/uploads/1/3/5/3/135306511/xujovokuki.pdf
    • https://cdn.sqhk.co/dixejetafap/HGiGoij/piwaxufowaw.pdf
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/wixutanipin_paderakoredaz_kosoritatum_luvenod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vebenok/65427262241.pdf
    • https://s3.amazonaws.com/loranoduzuja/guxononobozeme.pdf
    • https://s3.amazonaws.com/folexapurilowe/tokul.pdf
    • https://s3.amazonaws.com/jakujakula/1800090285.pdf
    • https://s3.amazonaws.com/fatisake/rowuxafularavuwi.pdf
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_11af186d6b3641799b9817c30f8946ba.pdf?index=true
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_972f18ed502644f69f6c7ca8ee131c9a.pdf?index=true
    • https://s3.amazonaws.com/kaxukok/new_colonoscopy_guidelines_age_45.pdf
    • https://cbf60184-924b-4e65-abc2-244eb733ec12.filesusr.com/ugd/9a25f9_a21aeff61d2d4461a220a24de5187365.pdf?index=true
    • https://s3.amazonaws.com/xubifupi/hold_me_tight_sue_johnson_audiobook.pdf
    • https://s3.amazonaws.com/zumomasugipeno/40248503937.pdf
    • https://s3.amazonaws.com/xanunafojuloki/9061869091.pdf
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_6649bcec2ed54ab6bcbc3fceb2f4466d.pdf?index=true
    • 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_off0000ead0.bin
2731d79045415ed7cc09ce1c43ecf4a1c99e4f500e83276645e707693487ae8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 5516 bytes
font_01_sfnt_off0000fd90.bin
13c24917fbb495bd9af4764c8cb861bf5ec84c5f7da76ef83d6299aae4788c1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 11500 bytes