Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91082807c4e9767…

MALICIOUS

PDF

66.7 KB Created: 2020-11-25 12:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f16816fb93119a8406d1487b47a98c3e SHA-1: 74b44f372d43e752a3f1651f20b24a5a53e7f40b SHA-256: f91082807c4e976745556ad8acea358c651fd498dadfbd77f21105f4c5d8b625
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 one identified as a malicious redirector. This suggests a tactic to drive traffic to malicious sites, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, and the PDF structure is consistent with link-farming or SEO abuse techniques.

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://traffmen.ru/strik?utm_term=metaphors+in+romeo+and+juliet+act+4 In PDF document text
    • https://tumogifizutuvo.weebly.com/uploads/1/3/4/5/134527103/jagadulonaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5fb276a6b5914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_5f9d7ad722ce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453885/normal_5fa943c44daa8.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/9a826.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/zuvurakufe.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/455de801-3ec6-4173-aa88-41a307ce96d9/suketesagusukaji.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/lezajus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/692c7543-4d5b-4488-9207-0180c982e1df/wilton_mini_bundt_pan_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e57b81-32c1-4fd7-92b4-4d8f9bdc9e94/yamaha_wake_booster_kit_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febb9dc0-cd93-4a91-a98b-65beb4fa7693/40049490797.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_off0000c961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 5480 bytes
SHA-256: d1c21972c5f9372917669c53a426aa31f36d9b1ef8d483eeaa3d6e64020a0a7b
font_01_sfnt_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 9936 bytes
SHA-256: a5317e899bc9512aeb56225169f31c333880789012dd2606c8fb3c4f50a59f00

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