Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe880eefc5019c3b…

MALICIOUS

PDF

78.7 KB Created: 2021-03-13 17:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eefef18605b046eb0d3b8bb0497e97e2 SHA-1: e1eed50b511c36bfa1bd7e6e31ad2aef0d3e2e50 SHA-256: fe880eefc5019c3b33847475ddeac80ce920b6add60254b892da84e8594eb28c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to various disposable domains and hosting services. The ML classifier and ClamAV also identified it as malicious, likely due to its nature as a phishing or SEO spam document. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/wix?keyword=the+viking+spirit+pdf
    • https://static.s123-cdn-static.com/uploads/4485823/normal_5ffbecdb53c72.pdf
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/3726145.pdf
    • https://cdn-cms.f-static.net/uploads/4413843/normal_603456456a388.pdf
    • http://viwavidif.getenjoyment.net/vamuseg.pdf
    • https://zefimaral.weebly.com/uploads/1/3/0/7/130776827/bomupelodujenam-xuvefiwisujotat-wirigajeri-lelibuzegit.pdf
    • http://mejumeroxara.mywebcommunity.org/focusrite_scarlett_2i2_install_mac.pdf
    • http://nurokojo.mypressonline.com/ravemobalig.pdf
    • http://dizaxabon.iblogger.org/nepazijeneluzegakadopege.pdf
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/302d6.pdf
    • https://vikuwavek.weebly.com/uploads/1/3/4/5/134506456/sezudu_kiwulaz_galexotekivo.pdf
    • http://nujilotadotila.iblogger.org/desojudafeko.pdf
    • https://zuranuwazob.weebly.com/uploads/1/3/5/3/135332575/lufudesozivonola.pdf
    • https://sipedevete.weebly.com/uploads/1/3/1/4/131438766/989534.pdf
    • https://static.s123-cdn-static.com/uploads/4486758/normal_5fcc7219e6465.pdf
    • http://barajofa.mywebcommunity.org/kaba_simplex_1000.pdf
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/0f223927c86d849.pdf
    • https://cdn-cms.f-static.net/uploads/4370778/normal_60319a4221a89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rusowemiwa.rf.gd/pegugopu.pdf
    • http://fekalalorupip.rf.gd/78655250423.pdf
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_ca641c819fd141538441a1a613fad857.pdf?index=true
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_66111e148d694946a9bc6aac35968ccb.pdf?index=true
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_79b5b438adab4310a6a244601e284127.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f448.bin
535e6dd4bb2d8f0348c3413e9d325d5fcb0aa4da250c7ea519b64343e0f33835		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 5132 bytes
font_01_sfnt_off000105cb.bin
d4077ea0fe76ad14f2d5d70a238ac615a6688262e8f82b2ddb8bd29076a67575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 11688 bytes

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