Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac7286ca2c7d0cb…

MALICIOUS

PDF

82.1 KB Created: 2021-04-23 00:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c28537730797083439a8bc78674cbe2 SHA-1: 51747a1f7f27091cc1ed9afca8755b8de92b781a SHA-256: 7ac7286ca2c7d0cb949af92cedc5e7bc4335dbb3e87a2b745788f8d8ca185f4f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs further supports the attack pattern 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://zajinet.ru/strik?utm_term=is+autodesk+inventor+easy+to+learn
    • https://cdn.sqhk.co/derepinejabi/6Sibe14/rapid_racer_products_rrp_proguard.pdf
    • http://workbykoder.xyz/how_to_program_rca_universal_remote_to_samsung_blu_ray_playergfnf0.pdf
    • https://cdn.sqhk.co/vuzefegevo/iefP7gj/19082425738.pdf
    • https://cdn.sqhk.co/gokovolasula/c9oI4Gf/best_sound_effects_movies_imdb.pdf
    • https://cdn.sqhk.co/fenazijeguk/dif2jIM/biwod.pdf
    • http://gobigs.space/difimikujevasuvasar0va2p.pdf
    • http://tipografiyav.moscow/86981164620fzzb5.pdf
    • http://gufutaca1.xyz/24143427319ic8cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_f16cf85669344bf8b65833a8f7dd179d.pdf?index=true
    • https://s3.amazonaws.com/tanapilamaxi/beaufort_county_school_uniform_colors.pdf
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_90bb6ffb289e497d818123cf8511be1f.pdf?index=true
    • https://s3.amazonaws.com/gofiguj/42772349016.pdf
    • https://s3.amazonaws.com/zerejibixupav/sebow.pdf
    • https://s3.amazonaws.com/zobuwubedak/android_9._0_pie_dark_mode.pdf
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_aff5e7cc0c82402a8e0a8a993be050e3.pdf?index=true
    • https://s3.amazonaws.com/seriposuj/73065786117.pdf
    • https://s3.amazonaws.com/xijilesuzuxo/bose_wave_music_system_will_not_play_cd.pdf
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_cf40ff05dc624f318f0532fbd85ef0f9.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_off00010249.bin
b4e485dfef64c8d57e845d17452b56e3d36d79cfed147d5b3096ec94d183fa71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 4984 bytes
font_01_sfnt_off0001135d.bin
68d2b5887ee525ded92737648580343fc0eb854ed37a2ce3348c537784dbf66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 11196 bytes

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