Malicious PDF — malware analysis report

Static analysis result for SHA-256 793ac696bd4076c9…

MALICIOUS

PDF

67.9 KB Created: 2020-11-09 23:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1216c85e3ff77d46d19e5384a26258f2 SHA-1: 9432b8c51751245e5ed614132b4a256e4339c068 SHA-256: 793ac696bd4076c901cd39eea8b4bba7423bb6722d959143af947139db4ee273
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?keyword=jvc+remote+codes+for+spectrum
    • https://sumadapovememer.weebly.com/uploads/1/3/4/4/134494733/sinerot-givugib-dagigirojimami.pdf
    • https://mebavowu.weebly.com/uploads/1/3/4/3/134353315/kivoremoxutas_zadeguwevazitit.pdf
    • https://cdn-cms.f-static.net/uploads/4428331/normal_5f99886a7e579.pdf
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/6d3adef31b174eb.pdf
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f8dfd3082951.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/12a2df73-0032-4202-8c2a-a34c359473e3/35795427382.pdf
    • https://uploads.strikinglycdn.com/files/d0b434b5-806e-4e3b-8d06-d0fe81196176/tulevikorof.pdf
    • https://uploads.strikinglycdn.com/files/b500e7df-198f-412c-8276-e225b2e4ca8f/rowutavukudegog.pdf
    • https://uploads.strikinglycdn.com/files/6445979d-8cb3-463b-bb6f-865b6f8eff4c/81136050745.pdf
    • https://s3.amazonaws.com/vunizi/egyptian_art.pdf
    • https://uploads.strikinglycdn.com/files/ad7d143d-3fae-4f39-9944-ddf396e6e365/tarigudepanu.pdf
    • https://s3.amazonaws.com/votubukaxogilix/google_feud_answers_key_2018.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_off0000cc57.bin
52ba1a1d8e27fd46fcceba567a2a9c3d7b55a61acb9cd39681eb1657e306effe
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 5108 bytes
font_01_sfnt_off0000ddad.bin
cd9acbc988890a0f9e577c6578e29f1966c7667ed04b4ed7796514f6bf702d03
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 10876 bytes