Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76c82f3d8c1cb41…

MALICIOUS

PDF

110.2 KB Created: 2020-11-18 15:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cd4717b24f2c54ff116540d3addf368a SHA-1: 7a59cbd369d5538539521e22bab7ada0ef9dadeb SHA-256: b76c82f3d8c1cb419da35954a57939f47af53d48ce8fe0d1de92a42f43c244f7
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://traffking.ru/123?utm_term=pathfinder+best+natural+attack+feats'. This URL is likely used to lure the user to a malicious site. The ML classifier also flagged this PDF with a high probability of being malicious, and ClamAV detected it as a phishing trojan.

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://traffking.ru/123?utm_term=pathfinder+best+natural+attack+feats In PDF document text
    • https://cdn-cms.f-static.net/uploads/4484610/normal_5fb2d732837cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5fa7259202c7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_5fa194ef25a24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5fb51fd085530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f9dca1286f23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fa489f1e1271.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/zonebon/hc_verma_geometrical_optics_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/uf_emergency_medicine_residency_gainesville.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/npc_scanner_for_classic_wow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c745f378-de1e-430b-90f7-64453d109b75/gtd_on_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56135326-c47e-4d31-aebb-2959d6f18902/18985709244.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/tebidirikemij.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_off00016506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16506 5088 bytes
SHA-256: 3d78f9445c3533263ed9f7591007f17e7bb4c10f7c2f1f16cd5300c7ed68c4e4
font_01_sfnt_off00017639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17639 11592 bytes
SHA-256: 23ce671ba57d4ca20af732fb408a3b3fb92dec365d37be8556b1bc6f38633beb
font_02_sfnt_off00019d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D4D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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