Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3c923771594288…

MALICIOUS

PDF

61.0 KB Created: 2020-11-18 08:54:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4499b407c60e63e261bbbb22f0e85d6a SHA-1: 744170345e7c40de446a52e4e2e7a404737ead40 SHA-256: ca3c923771594288e2b7c4d6badbf5a252688ffd720aeb5985e60853065e065d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a link farm and an external URI. The document body, though heavily obfuscated, suggests a lure related to 'Health psychology 9th edition pdf'. The presence of numerous Weebly and Strikingly hosted PDF links points towards a campaign distributing malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/strik?utm_term=health+psychology+9th+edition+pdf
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/1794229.pdf
    • https://cdn-cms.f-static.net/uploads/4370080/normal_5faf78035aead.pdf
    • https://xijuxesipokufi.weebly.com/uploads/1/3/4/0/134042605/bc3f87f6abd7b6.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/sesakaf.pdf
    • https://vutibije.weebly.com/uploads/1/3/4/6/134672754/xaxiwozutifaludo.pdf
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5fb321f3d7e70.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5058540.pdf
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5f94f3c1ef033.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6841d12f-e5f9-48c7-b2e8-a981d948244e/pizosanedazedotimenameja.pdf
    • https://uploads.strikinglycdn.com/files/0abc07fb-b489-4d18-9638-d0c1ccd7b156/dajajuzatawiko.pdf
    • https://uploads.strikinglycdn.com/files/4746f2ea-2e7b-4910-bac8-123562500d96/34605857362.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b028.bin
e844bafdb788433092684992c887ac9f80b93cf8b5f94bec015c55d53b78200e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB028 5540 bytes
font_01_sfnt_off0000c309.bin
0779c154f0ffe3cbd365b633d3ac8db69eb4555286735bfd5bfcca56f2fae08b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC309 10556 bytes