Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b2bdf5b57be04f…

MALICIOUS

PDF

79.8 KB Created: 2021-05-03 06:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c7f0a86783e3137b452ae803015d907 SHA-1: e9f09c07a6c40bb1554d60c053ce5d3eabea9e41 SHA-256: 16b2bdf5b57be04fa3cdc35247836feec538278797ae1d73532627628b31649d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://jumiwimov.ru/strik?utm_term=are+all+continuous+functions+differentiable+justify
    • https://cdn.sqhk.co/logubaxe/D4hhhie/fanosikezofapud.pdf
    • https://xutifapob.weebly.com/uploads/1/3/2/7/132712150/1ae97e73f44a2.pdf
    • https://cdn.sqhk.co/majatuto/gQBTwtf/92866082195.pdf
    • http://lisolu.org/52862740398qxt8q.pdf
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/4755752.pdf
    • http://marketeuro.pro/android_update_for_samsung_note_9j65zj.pdf
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/441726.pdf
    • http://retapadu.medianewsonline.com/is_jump_force_on_xbox_one.pdf
    • http://insurancesouk.com/how_to_analyse_descriptive_datayonmo.pdf
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/wazoni.pdf
    • http://vekisonoloze.sportsontheweb.net/gexogananiwa.pdf
    • https://cdn.sqhk.co/votiwixuduzo/iiahejd/color_350_passion_twist_hair.pdf
    • http://fsbsiod.com/firapofesodafaxebinezemetkmqoj.pdf
    • http://faxusupovetek.sportsontheweb.net/63864604095.pdf
    • https://weduparazibad.weebly.com/uploads/1/3/4/7/134710999/62453.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dudujopixejikug/40215322860.pdf
    • https://s3.amazonaws.com/libeganot/69296581547.pdf
    • http://nozozuwovore.atwebpages.com/burkes_outlet_application.pdf
    • https://s3.amazonaws.com/resisuna/how_much_do_regional_managers_make_at_planet_fitness.pdf
    • https://s3.amazonaws.com/siwixomudit/vijasaxomurajikumitoge.pdf
    • http://furunes.onlinewebshop.net/reliability_engineering_and_risk_analysis_a_practical_guide.pdf
    • 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_off0000f744.bin
e5fbee6d4084bbfd7257e3d86be013f59109cc498842c1e7d25da6a12fbb8718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 5324 bytes
font_01_sfnt_off00010976.bin
554a04bf8355d752077f9ef3e8ff03f5b3ee93c5a11fc1951118d230ed18102c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 11664 bytes

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