Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f2eb5975c0b6bb…

MALICIOUS

PDF

79.2 KB Created: 2020-11-29 04:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 91cc479587330b3c603aabc7f9de9ed5 SHA-1: bdf411aaa86ea8d66e7960f65b71c863ffd00b6f SHA-256: f5f2eb5975c0b6bb74151e2b4418d5369604d273b3dee41a5251af2c705ab99f
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://traffking.ru/strik`. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, including `https://s3.amazonaws.com/fejififimaketo/rfid_based_attendance_system_ppt.pdf`. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or trojan intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=d%25C3%25B3nde+queda+marruecos+en+qu%25C3%25A9+pa%25C3%25ADs In PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/7b4c3ad80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fejififimaketo/rfid_based_attendance_system_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370c0207-6733-443e-b3a4-a03aef9ba939/logovudajesimeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfdbb7c-6ad8-4cab-8346-8bb75a70a178/trigonometri_formlleri_tablo.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/cs_forester_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/electrical_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/vewobexowexupimojabitimat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fa1e39-3eff-4270-acf4-aeced2139114/gotilovuregafamitel.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/minecraft_kill_aura_1._10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f116765c-cf18-480c-ac51-8f4aa30429ed/homedics_foot_pleaser_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/how_to_check_airtel_net_balance.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 5400 bytes
SHA-256: 79fb23998e1c62a6cb65a8be581a27da6d9e3064119ec164564a83aa2d48f2c1
font_01_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 11588 bytes
SHA-256: 20ad166b498536d564a7c7b114c78cc48fb2e138231be378d42bac6735e7aa8d
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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