Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe71e6dcd78efee…

MALICIOUS

PDF

64.3 KB Created: 2020-11-18 05:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8de90588480f36bc3819949d28c444f4 SHA-1: 37185ff565aea6e2fb7e7df3a7f88d0b99f68d2f SHA-256: afe71e6dcd78efeeb7e4b6ae149fe4dd7909759babb226f77feea3d3f89c3c8c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate maliciousness. The presence of URLs like 'https://trafffi.ru/123?utm_term=slitherio+cheats+hack+tools' indicates a phishing attempt disguised as a cheat tool resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?utm_term=slitherio+cheats+hack+tools PDF link annotation
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/viroxupesilekexagag.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/67e9b97bc269.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/xalibudi_vited_potofesazad_kodenubos.pdfIn PDF document text
    • https://tozowibalap.weebly.com/uploads/1/3/4/3/134383498/1999029.pdfIn PDF document text
    • https://gebedevalofibut.weebly.com/uploads/1/3/4/3/134379687/95d66c553a33fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455390/normal_5fafe6e8e7714.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/korezukumidere-zotapokekava.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/8b3eb876-c77e-465f-924e-6a4a369ba811/rapidstrike_cs-_18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955423f1-f562-40b2-8cb8-ca296ce6e473/easybib_apa_format_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2c8f5b-f066-4939-a1c7-e5956e9308df/zidelapudabejavapiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89638f6-96a5-4169-8f56-7b7bd8a5ba7c/jimozinovusexobugotediga.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_off0000bfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCD 5052 bytes
SHA-256: 210b9aea935c540aff05b0fb30fb80e10fbf963c42e4155ca13507f9eecd5758
font_01_sfnt_off0000d0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0ED 10300 bytes
SHA-256: e41994a1eb5a9dc225e2c193936af22d0264306256c3bbcc5d98d9fcb891e7e5

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