Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85bf3189c70ec98…

MALICIOUS

PDF

109.9 KB Created: 2021-05-13 06:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 13784c0540473a3ed09cbdf91d75d73d SHA-1: 277e6f68413b03bfc25f20d651edaf599c5aa6c6 SHA-256: e85bf3189c70ec98460e0230e0d40dc24b7838b0b5369e1e8c45db2093b85b7a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to external sites. The document body, though heavily obfuscated, contains a search query that serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://leonvi.ru/strik?utm_term=how+do+you+get+symbols+on+dymo+letratag PDF link annotation
    • http://fumatiw.mypressonline.com/vitan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5fddd5522b1d5.pdfIn PDF document text
    • http://mujubow.getenjoyment.net/arapa_kelimeler_yazllar_ve_trke_anlamlar.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/hgQ66ij/balega_enduro_quarter_socks_review.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/dChjheo/microwave_cat_bed_warmer.pdfIn PDF document text
    • https://cdn.sqhk.co/gagunewatevo/b5ihigH/c._a._t_officers_uniform.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/51164860076.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/oMkjieC/12913941169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_605caec52334b.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/50199892938.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/skin_cancer_information.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/iJShfhv/world_cup_qualifiers_schedule_europe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_605d79dada775.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/019b9150-3a73-4c47-bf75-621747ec7d8b/william_wilson_edgar_allan_poe.pdfIn PDF document text
    • http://xinotitatidab.rf.gd/shooting_games_low_mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43908792-1256-4eae-a5a7-c7e838e3ed40/what_is_the_best_character_in_tower_heroes.pdfIn PDF document text
    • http://sasusijuxekexo.rf.gd/povebogisinojimijunawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79856762-87a5-4f9b-8d9e-eb0c56db0b77/jokigobojuxugisuvalovogix.pdfIn PDF document text
    • http://redilupabisaxo.rf.gd/electrocardiograma_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211c2c4d-cda0-4313-888f-63074a9cbbde/solving_the_procrastination_puzzle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea05d22-5daa-4f7c-a7d3-dcda37824aac/kawasaki_small_engine_dealer_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995fc300-e633-4878-961f-6a73587810d4/faduzasesawogita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc70424d-0d2e-46d2-9585-ec70a925c2a2/73170081864.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCC 5440 bytes
SHA-256: 1d49a36736cf3d3d910f4759cca71f94820c46a237f20ffb13f96554f7bba5f5
font_01_sfnt_off0001603f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1603F 2120 bytes
SHA-256: 9a87e2c8ec3d0236135a136d743d65d67287dff3092517805059f73a75161f90
font_02_sfnt_off0001697a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1697A 14160 bytes
SHA-256: 11699c94ab78ccf70570a3ddc2cdb72496bfa90fa689100c4e48d04d5edd76f2
font_03_sfnt_off000194ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194AB 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073