Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dabbb99b6446cf…

MALICIOUS

PDF

66.4 KB Created: 2020-11-17 22:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b37bd3d68c72c9fce3d9afb98968d19c SHA-1: d98c090cbb9c063547385eeb262905ddb43dcf71 SHA-256: 33dabbb99b6446cf2121e1339a7b3d77f7b4207d5f58eb70bd7dd36ac4b611c8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?utm_term=royal+story+game+on+facebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421939/normal_5f98abb3acd37.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/322079768.pdfIn PDF document text
    • https://ruzudafuzozuxu.weebly.com/uploads/1/3/4/8/134847081/nadexolor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_5f8b8c99eb3d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_5f9369bc7a363.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/sujezuvawuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_5fabb08c4772c.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/a87f7494-4986-4f3a-96e6-78a19977a8c0/voxumakomopojudabatigepuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb346f73-7ace-43f8-8fe0-4ff7a845bb3f/pugemegazinodixukiwok.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/38795461134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5ac6e1-3b7f-4a34-a537-0017ec467d56/datafamibigibin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5268b69e-d0a6-4546-92e8-8fb1db0bdaed/revue_technique_berlingo.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_off0000c42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42C 5512 bytes
SHA-256: d24a5fbcfd26512cc60a852eeafb1da931cab60068da95260129b12c99f8127b
font_01_sfnt_off0000d6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 10808 bytes
SHA-256: 9da4e5ccb2edcb3e65cb425cc23ed78dbec2ccccd40dbc831f6418093c0dd82e

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