Malicious PDF — malware analysis report

Static analysis result for SHA-256 16643bece7599e9f…

MALICIOUS

PDF

73.3 KB Created: 2021-01-08 09:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 44f7234e51d076e79eefcc51dfd173f8 SHA-1: 9314a351657f1132d85ddef9923d294a2a003567 SHA-256: 16643bece7599e9f1c3aa9f24b90d11b52c0b66c02410be970096c78bf87a250
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/wb?keyword=looperman%20acapella%20110%20bpm'. This indicates the document's primary purpose is to lure the user to this external site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=looperman%20acapella%20110%20bpm In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fe7ed2aeadb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498392/normal_5feaed3c29662.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/gfy3had/dragon_bubble_shooter_aarp.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/ghfZhjv/toilet_makes_random_running_sound.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f8895315996f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451565/normal_5fe23d958175d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_5fd2cda9339a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5ff694ad462be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450635/normal_5fa24b6a3c053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29fc746-a8aa-4e08-81e6-b72117b30676/ronidaxok.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/ecosystem_matching_worksheet_answers.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_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 5176 bytes
SHA-256: df3ab97d6e6815aa80c2a954389ece7f05c6188b1aa61ff85d91285cf3f3e421
font_01_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 10808 bytes
SHA-256: 90abc33b67582d8ffe2ec8f7d43d4bd439912204c760580aab7990b2f418fb75