Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc64bef0fbd4a8a…

MALICIOUS

PDF

67.1 KB Created: 2020-11-18 03:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a7a1761db4e07b5c16dd6ac46a8cfa60 SHA-1: 29e016859e3c952949179f453104c2065307fa74 SHA-256: ffc64bef0fbd4a8afef4677d4dcbbc22ccd622fe0917f9c7f6a40e294225a7c9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to 30 external PDFs. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL 'https://trafffe.ru/wb?keyword=test%20de%20aversi%C3%B3n%20al%20riesgo%20pdf' is likely part of a phishing or content-farming scheme.

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
  • 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/wb?keyword=test%20de%20aversi%C3%B3n%20al%20riesgo%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5fa44c078bbc3.pdfIn PDF document text
    • https://nezuwiwobitedut.weebly.com/uploads/1/3/4/6/134600585/b324a5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5f98122ceeb4e.pdfIn PDF document text
    • https://semopadilined.weebly.com/uploads/1/3/4/6/134696525/4716a1ef3a719b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422137/normal_5fadad03a79f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_5fa9927bc48dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f9678f4648bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_5fa9b7a24eecd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_5f8a80298ccd1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/henry_stickmin_free_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df3172c-d81a-4893-8b88-a2839ad1f777/21096437690.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/sutuzaxefodofoj.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/ps2_emulator_for_pc_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/kajetubipu.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/administering_medication.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_off0000c5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DA 5356 bytes
SHA-256: f194944a36e227511a1699c171fbbc9708ab0871c611f61a06be19df6d578646
font_01_sfnt_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 11796 bytes
SHA-256: bb31ae9408564539d712ad9eccf90d6a4f542277b17d7524fb958df349637804

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