Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb355b145d74349a…

MALICIOUS

PDF

72.0 KB Created: 2021-03-21 03:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 28cd8b18af4a1c1bc03ac01ef7901045 SHA-1: d0f1f0731cc6f73bb64fc3a50b95d4ecbe521e6b SHA-256: fb355b145d74349ad7c6cc06a2ceb39925d0ce38777ad72ee51d404dfaae5451
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be directing users to potentially malicious websites. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic point towards a phishing or SEO manipulation attack.

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://seumenha.ru/wix?keyword=hd+fatale+tanning+lotion PDF link annotation
    • https://rawoxoduzipuk.weebly.com/uploads/1/3/2/3/132302868/mexeze.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/eigUdgi/we_should_all_die_together_song_lyrics.pdfIn PDF document text
    • http://lutafem.getenjoyment.net/76210069832.pdfIn PDF document text
    • https://cdn.sqhk.co/fufowomusixi/gfjdgfd/final_fantasy_xv_characters_game.pdfIn PDF document text
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/a62c7e06e17fe9.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/MifHUhb/xurobixazuvujawel.pdfIn PDF document text
    • https://cdn.sqhk.co/funixatugesi/2ghicGK/25527405269.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/uichdhb/tuwobapirafopaluv.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/10084234679.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_43bf10fb5fc447fb80408302844bb393.pdf?index=trueIn PDF document text
    • http://ganadareki.rf.gd/10545807635.pdfIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_28a7cd90100d40a8806702e825124f60.pdf?index=trueIn PDF document text
    • https://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_93493c5e1dfb4c36b7695f0d582d4341.pdf?index=trueIn PDF document text
    • http://zuxebalu.rf.gd/mafovepitu.pdfIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_9a8254d7ffdd44e78906f7d0b33684eb.pdf?index=trueIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_29c807b613cb44b9834f2b35b734afb8.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_08ec53049e5949599fec747a4ff0c069.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_e6dacf8614b7447ea58b62305fca337d.pdf?index=trueIn PDF document text
    • http://joxumokuri.epizy.com/46476066011.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_e8603c7306b74e75a66972186521385a.pdf?index=trueIn PDF document text
    • http://gedonoseg.epizy.com/bekirijez.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_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 4760 bytes
SHA-256: cb0372ac7eff0cbe2d60741cb4bb7e627e90ad95196f74f05887d46f10ac5958
font_01_sfnt_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 11216 bytes
SHA-256: 76dbab1935129b077ccaa90ab7bfe5bb9e832d204298c9f44862170ca93c7c3b