Malicious PDF — malware analysis report

Static analysis result for SHA-256 c778d5618a8761c9…

MALICIOUS

PDF

73.0 KB Created: 2021-04-01 20:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e2cb7c5232f150e8bb64b26801126cf SHA-1: 3001de46ddc755935d557a1b0d4b4bf48c5c97c7 SHA-256: c778d5618a8761c98264c35c53509dd5305896ff4605c47c14ef8a4a98f201f3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=joe+pass+guitar+method
    • https://cdn.sqhk.co/mumaxifup/YGOYij7/bacterias_coliformes_totales_ejemplos.pdf
    • https://kufojinelimipi.weebly.com/uploads/1/3/0/7/130776518/buruji.pdf
    • https://cdn.sqhk.co/kixarozikej/qhb4hbL/5702971015.pdf
    • http://biwedujurar.mywebcommunity.org/general_mathematics_formulas.pdf
    • http://fodelogutejamit.getenjoyment.net/characteristics_of_information_age.pdf
    • http://poverkavoda.website/paypal_prepaid_mastercard_customer_service_phone_numbervgw6l.pdf
    • http://luminar2-download.xyz/1000781778359hej.pdf
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/raxowolo-kivofiwumago-sodavidopi.pdf
    • https://cdn.sqhk.co/jigavozef/jd4Rggc/bosuzulila.pdf
    • http://xamojopilupivo.scienceontheweb.net/mary_balogh_chomikuj.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://nature-ital.space/89802239551z45r2.pdf
    • https://lodovape.weebly.com/uploads/1/3/5/3/135350971/efe679a74888.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7fc5fd2f-21d2-4897-99af-1ad3d744f4a7/53776210065.pdf
    • https://uploads.strikinglycdn.com/files/93d4408b-2c16-4001-a463-3368a2579765/how_old_do_you_have_to_be_to_get_your_license_in_arizona.pdf
    • https://uploads.strikinglycdn.com/files/f279248b-7fc7-4b3a-946a-b876510006a4/womigegenuw.pdf
    • http://livirava.atwebpages.com/how_to_use_a_double_sided_waffle_maker.pdf
    • http://tiwatimab.atwebpages.com/language_practice_for_advanced_4th_edition_answer_key.pdf
    • http://zujakogi.onlinewebshop.net/21208372935.pdf
    • http://raxajabidadida.onlinewebshop.net/games_to_play_on_zoom_with_first_grade_students.pdf
    • https://uploads.strikinglycdn.com/files/ba4c4f91-ebc8-4041-ada8-a680567d7a2a/etymology_of_communication_meaning.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_off0000e0c3.bin
79c5683114ec5966ff996a2fa0a56f5125c7bc38086665251d025b527dd3d9dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 5332 bytes
font_01_sfnt_off0000f2b4.bin
b52382b44d5c33ab59c7e50f097ab2f2db26cb426c66cf9aa7bf32d7e84c9897		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 10652 bytes

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