Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c49dbb11383971…

MALICIOUS

PDF

68.2 KB Created: 2020-12-04 13:17:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 83d32e0d2d344165fe96e3692b271af3 SHA-1: 232274040586546643ebb5553f3bb1ca6aaef9da SHA-256: a5c49dbb11383971e50f5f41776e15dc1fdfd70079080f9a4ebd3df8cfa13e9b
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, traffmen.ru, which is disguised as a video converter. This indicates an attempt to trick the user into visiting a malicious site, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffmen.ru/wb?keyword=allok%20video%20converter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8cf91250b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5faa1e52b02ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_5f91a688d27a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_5fa1f98671105.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1c049c6d9645836281f45/t/5fc323cf4f98375720467c87/1606624208029/metals_nonmetals_and_metalloids_worksheet_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f349e2fce462bca5d5b8/t/5fc7e0f43fd7ff413f6f82ea/1606934774990/80616097611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fc1e8e-1934-45cf-be3c-b1859ed7f237/99237027214.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79ecceddbb05c68963a2e/t/5fc7f6ce6145c6573782f062/1606940367394/human_fangs_2_beat_em_all_apk_mod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a9a173fb5383b98737e/1606371996173/900967732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc79c759-b0f2-4b4f-9e98-7aff9216e3f1/zupukoluvexipirurusa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7c89955c744b53b4369/t/5fc859f692e74531f3c8990e/1606965760798/international_flight_boarding_pass_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ffeb0a1-68fb-4e85-b464-164811e55716/grand_junction_tv_guide.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_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 4660 bytes
SHA-256: 6f75f4e6c272268a3f834b630f1f14d0f985880cf5c9203d67e1a7b3f8fd45ca
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 10716 bytes
SHA-256: 49158da9fd4da7038d1bc1728669ce113565e86acd116f907d8f5de2e28685d2

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