Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3ca0eb9950c8ec…

MALICIOUS

PDF

77.5 KB Created: 2021-05-11 21:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e719c5b90011f643185e45efb1559af8 SHA-1: 503196dd11203146b5bfb89db4b858d4b502b4af SHA-256: 4f3ca0eb9950c8ec74fef882c53386bbcd0f1756630cd3d6d57daf7bb975256f
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://bologen.ru/strik?utm_term=is+call+me+by+your+name+realistic PDF link annotation
    • http://tederurokeroga.iblogger.org/sujadatov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403805/normal_5fc74f92cce43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_60380e9f7ddbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_6048601cac5ab.pdfIn PDF document text
    • http://ximikilanad.22web.org/82759097506.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454182/normal_60055dc42edd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_604cc3addc8be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_600f3b3e5e1e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_605218c965086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450257/normal_5ffa5df15878a.pdfIn PDF document text
    • http://xuwajofona.iblogger.org/sosuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_601000c71a239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/robbery_bob_2_unlimited_game.pdfIn PDF document text
    • http://simipibenafar.epizy.com/27375096580.pdfIn PDF document text
    • http://pipinodojo.epizy.com/app_store_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/zekuxubunumoran.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_88e66b63585b4a36881034ab04e1d7e7.pdf?index=trueIn PDF document text
    • http://fobugasa.rf.gd/kogefitonovenulom.pdfIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_71b808ba89b6400e85ea12b72f29b704.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_ee4e459abd0047719b7f9be156bee4dd.pdf?index=trueIn PDF document text
    • http://punolubumima.epizy.com/76395307584.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_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 5124 bytes
SHA-256: 43620da9011165ac5cc24673a1d562ef09bf3ddf1802a57e446ed3b066adc6e9
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 11076 bytes
SHA-256: eb1ef760dff915a1710a304d0b00f0d4198d370cc7105d09a5424de261cb3c15

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