Malicious PDF — malware analysis report

Static analysis result for SHA-256 9758ec6f7ef8685c…

MALICIOUS

PDF

72.2 KB Created: 2020-11-18 05:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4dbdfb3c1f4b13434c5a4f8c2d2a3e45 SHA-1: 07398f60e8bc627cf7c895f49efc9c1302e31a85 SHA-256: 9758ec6f7ef8685c3ec6c4dc00b7de316c813d4f5d1a9020bb5523442b2006ec
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic identifying it as a link farm. One of the primary URLs, traffset.ru, is associated with malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=guided+reading+activity+17-+2+american+history PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428078/normal_5f9fbac28a90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_5fb452fee63ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5fa7869e49e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_5f9108e9cdd71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_5f916f90d56dc.pdfIn PDF document text
    • https://miwugurelogubu.weebly.com/uploads/1/3/4/0/134000151/vedonu.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/mupukesunobaga/mikowodalam.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/dubefuxudarogejapad.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/physical_properties_of_alkynes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866f0d1c-0b40-4382-ad18-4e181f8cdb63/21672367680.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/24959144785.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_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 5812 bytes
SHA-256: 079950f147a9e83d780516d7697122ca9160ee225727722d62868eb6002c6695
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 10880 bytes
SHA-256: a256c07298ba0068a65e4ec778ca9c53d48549a72a8ac2d29e474d75ff796a80