Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c37287caa3b91ea…

MALICIOUS

PDF

64.9 KB Created: 2020-12-07 14:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5f1be25c6f0b6b02b6947127266cdffc SHA-1: eac73b250a423d1a8ec2150e8edc3d233f53dd1d SHA-256: 1c37287caa3b91ea643d6df149ae5e077045a4a0223a3945639c43620c015f4d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs, 'https://trafffe.ru/aws?utm_term=platform+technology+synonym', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?utm_term=platform+technology+synonym PDF link annotation
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/aaaaad28205c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_5fc1ba4f01eab.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/e1e50613-c4b5-4cbf-9b9b-9dfb4fb6e0aa/kupokukawutovapegorab.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/50754064176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98f1167-ee3b-426c-935d-c10d9b9f9a6d/tiger_simulator_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/xivoxevepuvemuvagezakagox.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/kudalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd963e85-0557-468d-ae8a-7d6308734331/wagesobifemosupewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ec0e7b-89f0-4580-b553-0235e3ab93d8/cursive_workbook_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9301cb5-1dd2-4c6d-aabe-6a5f01b03b9b/tales_of_berseria_heavenly_steppes_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88047242-3596-40c1-b77f-c74218489cf2/38406430294.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_off0000c1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FD 5400 bytes
SHA-256: 616f2929c15fa3d5ce32668149085097331ef1df25c9460f782de813c1f7c6b0
font_01_sfnt_off0000d43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43F 10132 bytes
SHA-256: 3ba2af7b3b02be9662322a69724380f8066494d9152f2b6da9f25938016587ba

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