Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae64a8d47ef6e73…

MALICIOUS

PDF

71.6 KB Created: 2021-06-13 17:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 743f7e71c4a047f08b801c6cc91f04e3 SHA-1: 460d16984304647ad0704b1235c4b068ef1adbab SHA-256: 6ae64a8d47ef6e73617d7894533f0626274a0295ed3737db9c59cb5d82251e16
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://smidgel.ru/pbw?utm_term=stardew+valley+fish+pond+lava+eel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422909/normal_6059d5754d59e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492586/normal_6057f7791d73d.pdfIn PDF document text
    • https://pakopigame.weebly.com/uploads/1/3/0/7/130738837/nadolekepavinajog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378607/normal_5ff7c3cd7ec6a.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/03d810cdcfc.pdfIn PDF document text
    • https://wezusuruga.weebly.com/uploads/1/3/4/0/134096163/3725255.pdfIn PDF document text
    • https://zaxiradijewebox.weebly.com/uploads/1/3/4/8/134889682/lidowilevexojiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_6019036bcac4f.pdfIn PDF document text
    • https://vufomugivubi.weebly.com/uploads/1/3/5/3/135350936/pubusesal-niligoxim.pdfIn PDF document text
    • https://zomubotedop.weebly.com/uploads/1/3/0/8/130873922/disexaven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5fdba6ae27e3f.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/63b92d4b-3c32-48d1-96f1-72e6a443e002/zomaviwowelilod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831b101b-6c68-4099-844c-1193c1333ed8/50638953496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ed0d89-c900-44c2-8e6d-110c7d7bf829/16737524150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6285ac16-a17b-40f9-b9b0-90fd43283618/79397103844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5e4f66-8056-4f2d-ac5e-a159d586a398/adolescence_steinberg_12th_edition.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 5484 bytes
SHA-256: f7e2b9dd40fa9954341cf7f2bab40b614572169d29b4c3ed0301183deb21794f
font_01_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 10228 bytes
SHA-256: 8995f75db41a215d5c0b0ba2e35ff8a57916066f9aeea97218ce58ba9ad32a1c

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