Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b99587421e258af…

MALICIOUS

PDF

70.6 KB Created: 2020-11-27 17:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b92b6da96bad52cd357fb6f2e4cb180e SHA-1: 1d2c6fd8854cd6ebc7b8f207e8c8b0e77acbd99f SHA-256: 0b99587421e258af41a7a7fc43832d0755dc9b1db65d6723af9bb7d691ee00e2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?utm_term=retro+mini+fridge+frigidaire In PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_5fbf6b234e50c.pdfIn PDF document text
    • https://jisasulozif.weebly.com/uploads/1/3/4/3/134371627/xugub.pdfIn PDF document text
    • https://kaxebovirufuj.weebly.com/uploads/1/3/4/3/134399635/c5caed1ce6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5fc0371908c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f9b9b2999693.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/e372e45a-6acb-4b6e-b2e8-54750d47289a/parulubunawizivati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f9f8d2-75e7-4720-8bce-3c42bdbd49e1/fun_with_ragdolls_the_game_age_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27195ec-fc55-4bf3-9d3f-0da2964ec9d6/18244647361.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/sorting_algorithms_mit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a94a1a-555b-407e-aa45-f217f33d1a4b/50102935751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d51e2c-5b6e-4b2c-a3e6-cda426f81518/34354875305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bf5fa4e-da94-443d-bd97-6cf81a197af3/52229731960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43f5145-8016-444c-9b33-291875ba364f/tofuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a737f1b-7c03-42a6-a695-0fbc7bedaf9b/farudujaduxamexem.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_off0000d8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 5024 bytes
SHA-256: e867ac9900b74f7692107840e0cffbecb2b107ce2c751b47c98a0cc3732416b7
font_01_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 10480 bytes
SHA-256: 1af1faf75bfe685cf8bce4a5551d42ed3d0a412bd3398e2b63d4f03538ad209b

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