Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c07ff15fdf5031…

MALICIOUS

PDF

77.5 KB Created: 2021-01-01 03:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 32de228777e7b5c3eaa271dd99aca6a6 SHA-1: 78d8671119990e51585992d9975a1371227ac8d8 SHA-256: 01c07ff15fdf5031745b8aa2187f8148ed48cf6e2cf7b84e6ebc05c715ae832d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various PDF files hosted on external domains, indicating a link farm or redirection infrastructure. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'traffking.ru'. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the extensive use of external links suggests a phishing or malware distribution attempt.

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://traffking.ru/123?utm_term=dred+scott+decision+worksheet In PDF document text
    • https://cdn.sqhk.co/vobipibomuk/dGii3ji/turugepegagiminot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392199/normal_5fde2afb3e11a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5fa1ab7dd92c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5fcbc72a80178.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/cSbigLa/lodixavozetex.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/2311290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fd664f6bb8ad.pdfIn PDF document text
    • https://kegilosibumu.weebly.com/uploads/1/3/4/5/134513635/c78226d732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_5f9147cbb1d52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427509/normal_5fa45b0294377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5fa37681683cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_5fa7df269d843.pdfIn PDF document text
    • https://jotevalosovem.weebly.com/uploads/1/3/4/3/134385082/busixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_5fba939470975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467915/normal_5fd13b1d6afad.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/5375bcd0-2fca-4120-a87d-3b028f43a268/5411326305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31afe3cb-1ec1-428b-88c6-8497b83ff7e3/frost_mage_pve_guide_vanilla.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_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 4940 bytes
SHA-256: 1853314728679f74812988a1b6c8e49048dbdb08f400dd704c3e490f1ac0bf38
font_01_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 10652 bytes
SHA-256: e5e4e22499d27fd6a60c2ecf2fffbec0d7a37fbaeafa5723d5c929e45ffc6487

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