Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0f856b2736b1c8…

MALICIOUS

PDF

78.5 KB Created: 2021-05-01 14:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf6d0f3576b40cfea3e58e03a68218a7 SHA-1: ead2e0823678c8e49e380aee3f0ab091b1835bea SHA-256: 8a0f856b2736b1c8a8da91d2fafb4d2453f6ab94b164112d80de4875fb9c7b39
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of link farms on disposable hosting, reinforcing the malicious nature of the document's content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=never+stop+never+stopping+netflix
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://copyright-infringement.business/mrt_dongle_crack_2.56_keygen_free_doo3nvo.pdf
    • http://ruszaimclub.ru/bexunejifategololag8wv8b.pdf
    • http://creamwalls.space/jukubagawexukuxewegynf8.pdf
    • http://newser.site/25760415451y2981.pdf
    • http://themarkuzmusic.com/xevaxefelenasakinollii2h.pdf
    • http://lusivemewuza.22web.org/figotezixof.pdf
    • http://instapriz.online/osrs_dragon_hunter_lance_vs_zamorakian_hasta5by5h.pdf
    • http://thecet.xyz/barter_6_mixtapedawmi.pdf
    • http://momelekunizu.22web.org/farorus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://puriruf.epizy.com/atmosfera_test.pdf
    • http://sobupedu.rf.gd/dupanonagom.pdf
    • http://lasikip.rf.gd/descriptive_research_design_examples.pdf
    • http://titasukutisun.epizy.com/aviation_weather_forecast_alaska.pdf
    • http://kakoxoduruze.epizy.com/heal_your_whole_body.pdf
    • https://uploads.strikinglycdn.com/files/65f26df6-a2f3-41fd-add6-d5cdb4ba01fe/imaginarium_polar_express_train_set_instructions.pdf
    • http://xixumosujo.rf.gd/57961179401.pdf
    • https://uploads.strikinglycdn.com/files/b4544190-c79c-48c2-9c3d-d38812aa55ac/jinipejasuwamuroxojuv.pdf
    • http://mamitepibo.epizy.com/dedarokulaxejalozu.pdf
    • https://uploads.strikinglycdn.com/files/d56bbd67-6108-4eb2-9ae7-355b74136e48/generales_de_dios.pdf
    • https://uploads.strikinglycdn.com/files/2b87fb72-d0f8-4aa0-80ae-2a2936141e97/nespresso_delonghi_lattissima_touch_restyle_silver_review.pdf
    • https://uploads.strikinglycdn.com/files/91a1c663-e0be-4c1f-b5db-4352953f5105/which_is_better_conair_or_wahl.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_off0000e7ac.bin
08af3cbfe7ac25b908abdd75262514d2edaf0dae5d4765b93d3e2678df9f30dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 4744 bytes
font_01_sfnt_off0000f7ed.bin
3a346cb6a76e887efb0f63137857d664b872f26fa44c615f02c1bc0750ab3b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10732 bytes
font_02_sfnt_off00011ca2.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 4324 bytes

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