Malicious PDF — malware analysis report

Static analysis result for SHA-256 697c09693f159507…

MALICIOUS

PDF

84.3 KB Created: 2020-12-30 07:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 336b457ac31bab888d11aa7515a4c9ba SHA-1: e28b7154dc6b0c4c87e47b64dc79171e9743f2b5 SHA-256: 697c09693f15950754e969a476838b7495c29ce37b67bd70b3189a9d340f6354
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=dungeon%20crawl%20stone%20soup%20draconian%20guide PDF link annotation
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/fb747d4f3aa.pdfIn PDF document text
    • https://rotiwoluxifu.weebly.com/uploads/1/3/4/5/134525243/vutunonu_lozolez_mokuxemis_sagebafut.pdfIn PDF document text
    • https://cdn.sqhk.co/zawafolor/ibhihez/naduguvoxobiteladujifoj.pdfIn PDF document text
    • https://kokarino.weebly.com/uploads/1/3/5/2/135299240/dirigefe-zosudufudan.pdfIn PDF document text
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/jeruk-dixaxonesifojo-zomizaved.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f8b649204613.pdfIn PDF document text
    • https://wekimede.weebly.com/uploads/1/3/4/8/134862148/1e1e7e88bb6.pdfIn PDF document text
    • https://pozegitewo.weebly.com/uploads/1/3/4/7/134758724/3fd24d3d6a0dbd8.pdfIn PDF document text
    • https://bafixexewav.weebly.com/uploads/1/3/4/3/134352321/6049387.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/kmgd4jb/zexetuginexogu.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/a3d802ab-6c22-4f0d-ac63-5bf596c371e6/lack_of_resources_in_schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9316847-5226-4902-8e02-41aadec1c042/first_aid_usmle_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea69066c-1f5c-4831-adb5-435dcf5f5d9b/italian_accent_meme.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_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 5332 bytes
SHA-256: 4656acd175272040e4564cae4e3eaaa1042e1e5a142130ff7805f635f4eaa48f
font_01_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 11580 bytes
SHA-256: d5b4289f17394ac22227e34e0505ce56dd31ec326fb1165ab7d4d8268abfd202

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