Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bc6fa58f2c26c7…

MALICIOUS

PDF

92.3 KB Created: 2021-01-10 12:23:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 03e93876abf6ff2455e4f6100b594635 SHA-1: 1b9da385683c2421eef8a932946720a4ed719cba SHA-256: 63bc6fa58f2c26c7f5049658586ae99dd72a625815d565a78a915c3d2c2e2f12
174 Risk Score

Malware Insights

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

The PDF contains a lure suggesting it is a 'car expenses worksheet' and includes a critical heuristic firing for a malicious redirector link. The ML classifier also flagged it with high confidence. The embedded URL https://cctraff.ru/123?utm_term=car+expenses+worksheet is the primary indicator of malicious intent, likely leading to a phishing or malware download site. The document body is heavily obfuscated, preventing a deeper analysis of its specific content, but the presence of a malicious redirector and the lure strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://cctraff.ru/123?utm_term=car+expenses+worksheet In PDF document text
    • https://site-1172364.mozfiles.com/files/1172364/hyperspace_mountain_paris_track_layout.pdfIn PDF document text
    • https://site-1175129.mozfiles.com/files/1175129/49713723777.pdfIn PDF document text
    • https://site-1171687.mozfiles.com/files/1171687/21422887282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477162/normal_5fe192aaa63b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5fcc016a29244.pdfIn PDF document text
    • https://site-1175480.mozfiles.com/files/1175480/11783322665.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/xapidajovaji/29702331846.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/background_hd_black_images.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/basic_house_wiring_manual_electrical.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/10995582465.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_off00012ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 5004 bytes
SHA-256: 1f21cf3cf14308501586abce03c2e97ab50d717286a388ce97b7935237671723
font_01_sfnt_off00013dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFC 11264 bytes
SHA-256: 1bb1146ee6edded57370b6be7292daf0ae05aa9673bdf9f756ef0df039f1b715

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