Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16be2e45d9a881a…

MALICIOUS

PDF

60.9 KB Created: 2020-11-27 16:01:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 99c8f6a5c824b6a666a8da1d40c923f2 SHA-1: d372aa3118c0537de1fdb14b54648cd39a6ce1b7 SHA-256: e16be2e45d9a881ad455ca28bb7622b939ea744f7f53ff683bec8bcb40884e3d
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 0.9996

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://traffking.ru/strik?utm_term=have+you+ever+seen+the+rain+lyrics+rod+stewart PDF link annotation
    • https://zadiletewus.weebly.com/uploads/1/3/4/5/134522124/5f26054219bdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_5fb8016e9f93b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_5fa8369438d3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_5fad2f629ef6d.pdfIn PDF document text
    • https://tojuseviru.weebly.com/uploads/1/3/4/5/134513446/32e29cd.pdfIn PDF document text
    • https://xujupemixupu.weebly.com/uploads/1/3/4/7/134745759/galijeduzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413735/normal_5fa47f4789c95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5f8fa58a20b4d.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/basujafasu_vezipefa_doguba.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/3f15494d9663fa.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/farejekisawor.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/fc88f4cc-f760-4227-aa7a-b57699c9d265/30273698651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f634487-1e17-4f72-adb2-0d33f640faed/temotid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd9b348-3d70-455e-ab89-65aad3f0181b/53575086073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a89c33-a1af-4779-b06e-2365b82bcb4b/nest_camera_alternatives.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_off0000b43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43E 5244 bytes
SHA-256: 32794a4f19eb7fc1e106c1c2f505cbb38df5ba94cc32a8516ef0fae0f5059cf9
font_01_sfnt_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 9556 bytes
SHA-256: 8694d99e1349efe2ce97397dd3b17a3761e96a8a743093801489b94ca281fb2d

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