Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbc11054c9a7f01…

MALICIOUS

PDF

81.2 KB Created: 2021-03-06 12:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dd216cee096b0ee5f39d4858bd0ccac SHA-1: 2ad39bdea9a150fb41019d6b8c1043e5f7aef3ef SHA-256: 8fbc11054c9a7f012cd7e1cc166dce01f7c3bae02844e9d400299bc7443cf045
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body is heavily obfuscated and contains what appears to be metadata from wkhtmltopdf, but the primary malicious activity is the extensive use of external URLs for potential phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/123?utm_term=how+do+we+define+operations+management
    • https://ladubikoniku.weebly.com/uploads/1/3/0/9/130969526/nalezovimonivib.pdf
    • https://pudakivofuleges.weebly.com/uploads/1/3/4/8/134853743/fadapitesozubafafop.pdf
    • http://wumiwuzigimo.mywebcommunity.org/kenmore_elite_convection_oven_problems.pdf
    • https://kisumeselebo.weebly.com/uploads/1/3/6/0/136021012/6288261.pdf
    • https://cdn.sqhk.co/xubupigegi/hl8iczI/42807238643.pdf
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/vumamapafu.pdf
    • http://ritegifufefut.scienceontheweb.net/danoduwovegepunoxixarog.pdf
    • https://kagebavewijove.weebly.com/uploads/1/3/0/7/130740568/1979486.pdf
    • https://tufezojaf.weebly.com/uploads/1/3/1/3/131384552/levikariposufij.pdf
    • http://pufivuziviv.mypressonline.com/how_to_install_britax_boulevard_front_facing.pdf
    • https://roxuxafuz.weebly.com/uploads/1/3/0/8/130813852/5b84efd8c0.pdf
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/xazojolokagir.pdf
    • https://cdn.sqhk.co/vofonowul/gi5sjaX/tojufalakedoxuk.pdf
    • https://xomijati.weebly.com/uploads/1/3/5/3/135329577/fuxeso.pdf
    • https://voxukosobezut.weebly.com/uploads/1/3/4/8/134846839/gepagobomubar-ripofonepifu-figefivuleruv.pdf
    • http://terakusinuw.mypressonline.com/gofejajenute.pdf
    • https://lefaxujil.weebly.com/uploads/1/3/0/7/130739779/wiwijun.pdf
    • https://vadizomozizi.weebly.com/uploads/1/3/5/4/135400682/fezazod.pdf
    • https://runolenasugu.weebly.com/uploads/1/3/4/7/134765044/mujot.pdf
    • https://nodejobirutita.weebly.com/uploads/1/3/4/7/134748641/juzekeno-gejefixozo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://visugog.myartsonline.com/fofoxapevuzisesasesu.pdf
    • http://xegilejefaga.epizy.com/khandeshi_gane_dj_song.pdf
    • http://lilepav.rf.gd/3359284030.pdf
    • 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_off000100ee.bin
f05263844f4f8a060e416a194d0d115b5eb284e1e64a68aa20d92f7f5da131e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 5380 bytes
font_01_sfnt_off00011339.bin
5e1df09c88233784891e4b7f8f23fb6dd9f53bf140a2a8736b6d417bab37eefb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11339 10628 bytes

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