Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9af99e4568a58d2…

MALICIOUS

PDF

74.6 KB Created: 2021-03-04 12:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8eec2194140b6bca96230f516a9f2a76 SHA-1: 8b2b20f57b5ae514afb50ae95ae2097a6c527e85 SHA-256: a9af99e4568a58d26f91836e8527a58d8dbd6fe2e2c5fa23d27df98669207028
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it contains malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a callback phishing or tech-support scam pattern, where the user is prompted to call a phone number. The presence of numerous external links, including one pointing to 'xajibur.ru', further supports a malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

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 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.
  • 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://xajibur.ru/strik?utm_term=nortel+phone+system+not+ringing PDF link annotation
    • http://pidawudimo.scienceontheweb.net/life_fitness_95ti_parts_manual.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/jijemutowa.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/76135938644.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/70211104618.pdfIn PDF document text
    • https://xefinaloze.weebly.com/uploads/1/3/2/8/132814425/7592369.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/1659173.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/how_to_use_logitech_wireless_keyboard_k400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojenixerog.myartsonline.com/how_to_start_learning_python_step_by_step.pdfIn PDF document text
    • http://jozopon.rf.gd/nds_pro_emulator_for_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/37670733487.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/70313786662.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/improving_vocabulary_worksheets_ks2.pdfIn PDF document text
    • http://tewifasizibag.epizy.com/livro_historia_do_brasil_para_quem_tem_pressa.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/mujebagomafituvisobu.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/48768259009.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_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 5096 bytes
SHA-256: b8e0fbd0fb516a4a5f28114e347fbd25dce320dd5969f9e90439020e876aa5f8
font_01_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 10828 bytes
SHA-256: 84678237eb1b5d0e2d5e06bbabd8cef2734cc36bd372a77932b793be490fe1e0

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