Malicious PDF — malware analysis report

Static analysis result for SHA-256 54603eeaf77b9035…

MALICIOUS

PDF

77.4 KB Created: 2021-02-02 19:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f236f3350c75308656ac616401621699 SHA-1: d2c147c86dd6a257fb78b4ce788bf069d05688bf SHA-256: 54603eeaf77b9035f369f1609f0b728619b9ec76f1fe922ed408919377f1f4c1
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using numerous links on disposable hosting, likely to obscure malicious destinations or distribute payloads.

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://jacksth.ru/123?utm_term=the+little+couple+2019+schedule
    • https://muvepabeburok.weebly.com/uploads/1/3/1/4/131453329/vuderikoxavowitiv.pdf
    • https://gesimuto.weebly.com/uploads/1/3/4/6/134685476/xegutit.pdf
    • https://cdn.sqhk.co/monasomeb/idhjjd4/tijulevivijova.pdf
    • http://dixojele.22web.org/42072553314.pdf
    • https://cdn-cms.f-static.net/uploads/4403274/normal_6010881c7cca2.pdf
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/xanopilovasagupega.pdf
    • http://walletelectrum.buzz/wikipedia_madame_gao4uuzr.pdf
    • https://static.s123-cdn-static.com/uploads/4413000/normal_5fe03caca1522.pdf
    • http://kengoru.space/75246588479zwsyb.pdf
    • https://cdn.sqhk.co/nivunufozub/Ficwji1/7050949721.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://doxekapop.rf.gd/landscaping_business_proposal_template.pdf
    • http://fujebudavitasoz.epizy.com/acrylic_sheets_brisbane.pdf
    • https://s3.amazonaws.com/vosimalume/25853629587.pdf
    • https://s3.amazonaws.com/watajive/nature_wallpaper_for_pc.pdf
    • http://sarozaxag.epizy.com/51170983147.pdf
    • https://s3.amazonaws.com/tetofamuxulil/65327414225.pdf
    • https://s3.amazonaws.com/neviwove/dolisizurigi.pdf
    • https://s3.amazonaws.com/joterige/rasiweratum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e400.bin
d5b2423ddab7e6af4bc17437137e1fd3ed74e37bf776faa2781ba413ab50445a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 5064 bytes
font_01_sfnt_off0000f551.bin
1c25415f686633ce4e4e29d50f47ce7d7efdbeccde31bd8834d268ff643e69e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10756 bytes
font_02_sfnt_off00011a0e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 4324 bytes

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