Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d96b9b9a369a00d…

MALICIOUS

PDF

66.7 KB Created: 2020-11-22 08:26:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 811db79d53d560d8d1688250c90b2703 SHA-1: d6e234ef9fd88969ce4e344f15ef8773aef4ddfa SHA-256: 6d96b9b9a369a00dfe87d603454690e1cfb241409f39c1d8243783a4b967b865
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or directing users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to drive traffic to potentially harmful web pages, likely for credential harvesting or malware delivery.

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/123?utm_term=samsung+wireless+lan+adapter+wis10abgn
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/8595799.pdf
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/272418.pdf
    • https://cdn-cms.f-static.net/uploads/4447252/normal_5fb50d19c2b6a.pdf
    • https://cdn-cms.f-static.net/uploads/4490128/normal_5fb9c773aad5f.pdf
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5fad9dd110996.pdf
    • https://cdn-cms.f-static.net/uploads/4424696/normal_5fa6e14b7d61e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/36f46edf-ac6c-43a0-959b-6a6f412561f4/jifos.pdf
    • https://uploads.strikinglycdn.com/files/a3dde61a-2fd2-4372-9319-0eb3cac64164/sogipapazagilebuzorasi.pdf
    • https://uploads.strikinglycdn.com/files/439a0809-3de8-4410-ac3d-87b2f2eb9cb0/sizamezabokuk.pdf
    • https://uploads.strikinglycdn.com/files/078e83cc-f51e-4fdb-9ef0-162c2fd87a40/la_chachara_vende_tus_cosas.pdf
    • https://uploads.strikinglycdn.com/files/c896d6c0-3e72-4682-9f30-55090cbe181f/daniel_fast_food_list_lakewood_churc.pdf
    • https://uploads.strikinglycdn.com/files/74fcc926-bf05-40f6-9e7c-d7fbdeab013f/nikon_d810_manual_english.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_off0000c594.bin
36bf67e92c150e875b79385dd1d7de17411fc9bc3a0b18b6c6795b1fd7e538a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC594 5808 bytes
font_01_sfnt_off0000d94e.bin
91f07f1387433d8b4ece4197f8b0bb2fc36728ec820ca7fb2fb92cb4f00a75a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 10784 bytes