Malicious PDF — malware analysis report

Static analysis result for SHA-256 505c72e97c951768…

MALICIOUS

PDF

65.3 KB Created: 2020-11-25 09:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 855962156ec13be64a759beb2270b2d1 SHA-1: 55c095217f9acc898f76e2d721875b9a35c35a1c SHA-256: 505c72e97c9517684a5ac8de7a8911bd31336de966344e13514c3d765cc0e97a
156 Risk Score

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 0.9999

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
  • 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://trafffi.ru/123?utm_term=cohen+testimony+stream+audio PDF link annotation
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/zurod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f91d0628230c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5fb4907244c87.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/kezunusazezofotaner.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/ee94125b-b750-4526-a1f2-bfaecbd1bab9/putnam_county_tax_deed_sales_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d04cf03-44f4-42dc-b686-b0874299d4e7/rumosiniwudig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cb8a66f-05f9-4f5b-bff1-b36c28fd8a93/54577033468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f69f14c-9de2-4a49-ae8a-1ea7ec6d4876/54406856040.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/zazigirutobov.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/95634432279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f3fddd-e77a-432c-9b68-edf83da077eb/football_heads_2018_19_unblocked.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_off0000c32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32F 5040 bytes
SHA-256: f37539eee4047d70b2fb069cdebcf00c475fa67df82d8f4854ded2937e423b23
font_01_sfnt_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 10720 bytes
SHA-256: 78309a6c35d3a1dbd75394c612f0e4391cbc050af19a29dc7ef69f0a68864d2d