Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98b15cb74a4eb00…

MALICIOUS

PDF

69.8 KB Created: 2020-11-25 05:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f99c60ab57733e5207614e56887ad17c SHA-1: 2e28fe729a9bb2bfebcc053f2fa60c349b3a110a SHA-256: b98b15cb74a4eb00e3b3315bff21b6df4e129f479bb6489890b1e14d0039e4d3
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=emotions+group+activities+for+adults In PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/vegoxasojo.pdfIn PDF document text
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/7132665.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/dorixibebat.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/3257372.pdfIn PDF document text
    • https://tuzuwopibas.weebly.com/uploads/1/3/4/3/134316447/wevilivur.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/9ecc6771f91.pdfIn PDF document text
    • https://fejagirizow.weebly.com/uploads/1/3/4/5/134525681/bonudifu-kesel.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/jixenuvuvomotix-lamen-liwilileji-zewesu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/68414345-f053-4fc2-b6d1-19f42a6ec4bd/67886711014.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/60034035319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6284874e-69df-46e2-87e6-a98183f77a83/priyanka_chopra_net_worth_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b806ee-6311-44e7-be97-80cdd245ad62/kavewabizevuwexesalena.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC796 5376 bytes
SHA-256: 27570fea0878bb7872fc7cd4c041a5027ea889698946ebb39a807705fd4bfdbf
font_01_sfnt_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 10064 bytes
SHA-256: 8f0976dd9fb88a30b58e6f33afbce4e43f88137c7a4e9ff2c330b72ff52c1c62
font_02_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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