Malicious PDF — malware analysis report

Static analysis result for SHA-256 d837cceaa8ba2195…

MALICIOUS

PDF

73.7 KB Created: 2021-02-14 23:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 32087318906e7e74d78fdc250dbb912f SHA-1: 870e2814d0f719615457ae6dc2d5d6c7206411ba SHA-256: d837cceaa8ba2195acf035ff2f2c59b3d6240175db8823058a56cf9e7dd64dff
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The embedded URL `https://seumenha.ru/123?utm_term=angry+birds+2+apk+download+for+pc` suggests a phishing or malware distribution lure, attempting to trick users into downloading software. The PDF also contains numerous other links to disposable hosting, characteristic of link farms used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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/123?utm_term=angry+birds+2+apk+download+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383160/normal_601789241cd72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401691/normal_5fdfd877c000c.pdfIn PDF document text
    • http://fajutixosisi.22web.org/performance_appraisal_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/idgjjhD/19039305040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_601469f432e5d.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/IibjfDI/votovafajasasirebelatuted.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_6015ae24dbb68.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/eBhhjid/lukepilediduloliba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenamumiv.rf.gd/23933452162.pdfIn PDF document text
    • http://lozabozirazal.rf.gd/bass_boost_audio_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/capital_formation_meaning_in_malayalam.pdfIn PDF document text
    • http://dekuxibasor.rf.gd/xuwugi.pdfIn PDF document text
    • http://lutaxipokujopej.epizy.com/asura_bgm_ringtone_free_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/android_auto_app_fr_iphone.pdfIn PDF document text
    • http://lozepis.epizy.com/advanced_itt_exam_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/vepomapolebinezabu.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/android_fragmentpageradapter_behavior.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_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 5844 bytes
SHA-256: 076d782fe76b943e7c8387a92fdbdad88cd348f29c99c2af614f7c6c91b60bab
font_01_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 12808 bytes
SHA-256: 865f10c20a4b1924a095e167f5828bf07cae74eef493e65cc12bfa401d6d6faf

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