Malicious PDF — malware analysis report

Static analysis result for SHA-256 359811230e19b723…

MALICIOUS

PDF

79.2 KB Created: 2020-12-21 01:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 536b70f6e96d074138fdf8fd9dda3158 SHA-1: dce4b22445745df64b56e32f54b0c1d413e5cbc5 SHA-256: 359811230e19b7237c32dae6e558bf1cbef01f2db5153016ed40ec0fe74fe8ef
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://traffnew.ru/strik?utm_term=cookie+swirl+c+roblox+fashion+frenzy+new+video PDF link annotation
    • https://wenajatimox.weebly.com/uploads/1/3/4/4/134480159/gogefomiluwi-sagew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_5fd7f31e56279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5fae6a072c473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5f991c4b60125.pdfIn PDF document text
    • https://josugonu.weebly.com/uploads/1/3/4/4/134488469/6118867.pdfIn PDF document text
    • https://jiwozipepogi.weebly.com/uploads/1/3/4/4/134462700/dasobakererunetaxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443578/normal_5fd061b433ed4.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/wuzeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_5f91458d0db63.pdfIn PDF document text
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/kamosekamizurug_foworo.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/f083f1eb-a9f0-4434-8859-be83594bee96/15768302748.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/d_d_5th_edition_bestiary.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2a692dcd53187f1e8c64/t/5fdd9b436a6ad7222f0505c1/1608358724205/grace_reformed_baptist_church_houston.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde97c9d0ff57695e6cefc3/t/5fdfc9a52da99c28683bd8e7/1608501670432/22278314016.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 5592 bytes
SHA-256: a1fc0e5e88b2cee47ec4b341aa9ed1f19ba1f28d629ba33e7a8efd9855438102
font_01_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 11644 bytes
SHA-256: d98fe224dd5e4c116a97cd6ddfeafa344040be15d1e9fed7754f6c01a3d4b476
font_02_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 16524 bytes
SHA-256: 9c5b70a44bc27d4074d4bf87dc6bd67127ce8878391fa4ddfc9e98515d1dae47

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