Malicious PDF — malware analysis report

Static analysis result for SHA-256 383338353e0200a4…

MALICIOUS

PDF

80.9 KB Created: 2021-03-22 20:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d17a2e379f8ae43bd352c3a399c7d2a SHA-1: 0767cf0173dc5a255d53377ccabd271728ca2f29 SHA-256: 383338353e0200a4aa68995f8a8c4371b2ad58c3a46d4d4365e65a7abf87b920
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/aws?utm_term=best+master+of+orion+game
    • http://obsluzhivanie-kompyuterov.moscow/tufoguzagezuolngq.pdf
    • http://organicnu.info/pexoxizegepuzofadopegiw4vrn.pdf
    • http://vedice.ru/colonisation_game_guidejs9ip.pdf
    • http://jiliwurevefo.22web.org/essential_evidence_based_medicine.pdf
    • https://natozopito.weebly.com/uploads/1/3/4/1/134108601/40376.pdf
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/fogopujerebev_juxufafa.pdf
    • https://lasasozizo.weebly.com/uploads/1/3/4/0/134041343/xiturekoxo-lubozapi-wezasapamemotet.pdf
    • http://blue-tick-central.com/harry_potter_libros_coleccion6d3r9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvemasoxaji/thomas_cook_cash_passport_information.pdf
    • http://nojisibi.rf.gd/66371366949.pdf
    • http://wotanuxofewaru.rf.gd/informal_report_writing_examples.pdf
    • https://s3.amazonaws.com/toliwudalamem/cal_osha_flammable_cabinet_requirements.pdf
    • https://uploads.strikinglycdn.com/files/2adc7cb1-4ac8-425d-a5a9-02eeea7e203b/natojumiroreluvu.pdf
    • https://s3.amazonaws.com/sejakopa/6761864340.pdf
    • https://s3.amazonaws.com/jenagubadopi/88417812863.pdf
    • https://s3.amazonaws.com/dinigugaxej/45837100852.pdf
    • https://s3.amazonaws.com/difigomisosak/blood_pressure_guidelines_for_intracerebral_hemorrhage.pdf
    • https://s3.amazonaws.com/fizaxo/universit_di_camerino_ingegneria_informatica.pdf
    • http://xigakixu.epizy.com/bongo_cat_meme_template.pdf
    • https://s3.amazonaws.com/vipinib/uc_browser_software_for_windows.pdf
    • http://nutonujisebife.epizy.com/intangible_assets_valuation_report.pdf
    • https://uploads.strikinglycdn.com/files/d0338d09-bf35-4ec4-b582-35185d5f743f/star_trek_the_next_generation_funniest_episodes.pdf
    • https://uploads.strikinglycdn.com/files/81c2f94c-017d-4c78-8766-af2fde039eb9/zijekijitim.pdf
    • https://s3.amazonaws.com/mufukep/76645911829.pdf
    • https://uploads.strikinglycdn.com/files/23965505-6dfe-49f0-ac59-c00f17bb79a5/21521871846.pdf
    • https://uploads.strikinglycdn.com/files/fb7a4fb5-cd3a-4e98-b0cc-f64fc638cdb5/formula_para_calcular_la_molaridad_de_una_disolucion.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_off0000ffb0.bin
e05472d41486fa3de4d490bce2de9e48762ddcc75fc472eae76726db57067ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 5104 bytes
font_01_sfnt_off000110fa.bin
1575051cb51019d73525c96a6f98ba9c793af6af2db0d62321ff867fb192f91a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 11200 bytes

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