Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ac99d212d71353…

MALICIOUS

PDF

74.4 KB Created: 2021-02-24 00:23:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e968a51e43dfe2d06d61d25390dae6e7 SHA-1: b519c997f2cbe844c9d660a8e90e36e2fc04383f SHA-256: 33ac99d212d71353f735f37c5c91b4437d08ab7f27d44c883feef0bea252b38e
146 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains multiple external URIs, one of which is a link farm designed to redirect users, and a heuristic indicates it's a callback phishing lure. The document body, though heavily obfuscated, contains text related to 'Exide battery charger' and application metadata, suggesting a potential lure for a scam. No scripts were extracted, but the presence of numerous URLs and the callback phishing heuristic strongly indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=exide+battery+charger+70-100+for+sale PDF link annotation
    • http://labiosdewonda.com/gizekelovulapiesk8n.pdfIn PDF document text
    • https://foxaxefaga.weebly.com/uploads/1/3/1/3/131398491/witurezeruwilezuxi.pdfIn PDF document text
    • http://ita-bio.space/tizasizugutelubodikijilzcaa.pdfIn PDF document text
    • http://autokenn.com/angulo_de_elevacion_y_depresionysvh5.pdfIn PDF document text
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/niwotibagexikif_jelolodakemorig_bivevelo.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/givikodusasonoleko.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/test_de_inteligencia_emocional_para_imprimirbh9q8.pdfIn PDF document text
    • http://fullhp.info/how_to_cook_brown_rice_in_electric_pressure_cookern19ff.pdfIn PDF document text
    • http://khanapoorti.com/rofabegofi143p3.pdfIn PDF document text
    • http://kubikox.iblogger.org/watch_the_hunger_games_catching_fire_online_free_123.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/dubiditiginowo/billi_billi_akh_song.pdfIn PDF document text
    • http://timarerovasezot.epizy.com/advanced_abstract_algebra.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/iracing_mx5_setup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/general_physics_questions_in_hindi.pdfIn PDF document text
    • http://pevivudawof.epizy.com/guide_d_installation_livebox_pro_v4.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/cedulas_de_auditoria.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/breath_of_fire_dragon_quarter_android.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/caitlyn_guide_s8.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_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 5856 bytes
SHA-256: 7b24a884f449709be3f4c4fbef5deb604bb66f9e648bc594251e905b02563426
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 10356 bytes
SHA-256: a89d1d0a6455aa34f535d6acc696b901ff4566ee2149d701138d12a90aff8090

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