Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefadd7bffc1b281…

MALICIOUS

PDF

76.9 KB Created: 2021-03-06 11:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e10ccbbca289cb1602482c3255c799a3 SHA-1: 5d9a554f9b932049ed188fa0331be2ce302b2c15 SHA-256: aefadd7bffc1b281f59b59224106c7b5c0f793ee733ff0f382cbe5a54cd425c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to distribute phishing content or malware. The PDF structure and embedded content suggest it's designed to exploit vulnerabilities or trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=ezcast+apk+for+tv PDF link annotation
    • http://sale20.site/mackie_cfx12_mk2hapih.pdfIn PDF document text
    • http://erogancolumbia.site/how_many_calories_in_a_maple_bar_doughnut4h9x5.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/wemovurokap.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/73472577386.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/bbieERt/lalazorekowuk.pdfIn PDF document text
    • http://flymoney.net/statistical_mechanics_mcquarrie2ini3.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/optiplex_760_upgrade_video_card.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/40015318262.pdfIn PDF document text
    • http://naturfresh.fun/sofobogjczns.pdfIn PDF document text
    • http://alsamcctv.com/how_to_make_a_budget_for_beginnerssij8d.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/EYujhie/battle_heroes_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/hjU44ib/67528689748.pdfIn PDF document text
    • http://arthromedshop.xyz/facebook_lite_update_version_2019914vh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ropupifalapoges.atwebpages.com/fofuzonezotam.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_747d9b06b7074dfe8ffdbf2edf78319f.pdf?index=trueIn PDF document text
    • http://wadoromutisagar.myartsonline.com/luxatonomo.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_a6b6fac92dd74a79b9e1442c940b2af9.pdf?index=trueIn 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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 5108 bytes
SHA-256: 5b822e27789f1dd7d78bffad900a90ed91d77d999d0b4b4d08fc946df8fb58f5
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 17648 bytes
SHA-256: b327cc3d0431d64ec9a64b5979dbfa4d0e83a96a2854762be627a49ea1cf6e7c

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