Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cde8bae13979e6…

MALICIOUS

PDF

62.7 KB Created: 2020-12-28 17:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 23b88d0e195bc2f221abe89306c3cfa2 SHA-1: 76ee97fb5f3d43a18c1964a4c4f54f888a529e5c SHA-256: b7cde8bae13979e67b2d07e79a1c021eadcedc3c1eb2b2ff803a8c1d67399ba6
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'gettraff.ru'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external PDF links, with 'cdn-cms.f-static.net' being the first observed. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/aws?utm_term=power+belong+to+you+gospel+song In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481400/normal_5faf6850ca97b.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/1818567.pdfIn PDF document text
    • https://cdn.sqhk.co/potexunajo/jbIOghe/microsoft_teams_download_for_desktop_windows_7.pdfIn PDF document text
    • https://velabusodogir.weebly.com/uploads/1/3/1/8/131858366/9dfaf12fbefae.pdfIn PDF document text
    • https://razulusajo.weebly.com/uploads/1/3/4/4/134467314/barenubes-pufakaz-tunoroxise-fetesuxepu.pdfIn PDF document text
    • https://sigegasolo.weebly.com/uploads/1/3/4/7/134732441/pesotomasuxef-begefabenada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5f904deeaaa6d.pdfIn PDF document text
    • https://cdn.sqhk.co/ritafase/DkieMgg/portal_pinball_groupon.pdfIn PDF document text
    • https://tapojofam.weebly.com/uploads/1/3/4/5/134518610/tewanige-wolizevuwo-nupuwadufomed-dumafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/mewudujafuzanu.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/linux_download_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/clarion_cx305_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/pregnancy_calculator_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/6th_gen_civic_body_kit.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_off0000bb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB06 5112 bytes
SHA-256: 9893726313b2a2c391a5ea7e2fac25cbf59503235fb1434aaee8d1f83e9bee20
font_01_sfnt_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 9792 bytes
SHA-256: 950a92a006782adf315ebd27b2ce93f818d4a491c437cae7a4a686520e73ddb8

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