Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e39e06ec3d554a4…

MALICIOUS

PDF

77.3 KB Created: 2021-02-27 16:23:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5f1799e423250bd2001f051723085598 SHA-1: 4784b0f185e8c7f02c7dff99641d396fb588781f SHA-256: 5e39e06ec3d554a41cb4649a95b73fbf1a4a454d8b795dba53182dd2ba6d0095
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the true destination. The document body, though heavily obfuscated, suggests a lure related to free sheet music, which is a common tactic for phishing or malware distribution. The presence of embedded URLs and the heuristic firing 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=free+piano+sheet+music+adele+someone+like+you+pdf PDF link annotation
    • https://cdn.sqhk.co/faresawuf/igeqghJ/rinajev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388169/normal_6004851cf3cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_601159a02c66e.pdfIn PDF document text
    • http://simultaneously.space/scary_movie_1_download_720p_dual_audg0c33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484126/normal_5fdee508d28ed.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/Lxgd0rr/gfx_tool_for_asphalt_9_legends.pdfIn PDF document text
    • http://worldthailand.fun/607777607715mgvh.pdfIn PDF document text
    • http://activa-fb.com/nubs_adventure_unlocked_apk10kfj.pdfIn PDF document text
    • http://giocodigital.fun/viwikurebim0s16.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/hie8BUQ/s._g._p._t_means_in_urdu.pdfIn PDF document text
    • http://vedice.ru/simple_past_affirmative_negative_interrogative_formsui1e4.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/Jhj8ghh/independent_baptist_sunday_school_lessons_for_adults.pdfIn PDF document text
    • http://axacheat4.xyz/20741099948hrxn1.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/gggjygg/9715981244.pdfIn PDF document text
    • http://smartcreditcheck.info/un_curso_de_milagros_escritorasbgim.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/Vjau3dt/arka_master_brick_breaker_achievements.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473903/normal_5fe257df9350a.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/vukumesoj/90046004888.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/genome_biology_and_evolution_author_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/calendario_escolar_malaga_2018-_19.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/furesezikaboxixologu.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_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 5516 bytes
SHA-256: cbe560aad0382a8648384649085002015f01f5ed06d29578b2f995b7401aa3bd
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 10728 bytes
SHA-256: 139aa5f7ddb788e5873bf0d6ea33f7daaaee5db6d68403043aa22b6095efb178

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