Malicious PDF — malware analysis report

Static analysis result for SHA-256 769f191b89d71d9b…

MALICIOUS

PDF

107.1 KB Created: 2021-03-22 19:33:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ff0e645dcda48b2affa108b852e0f116 SHA-1: e651d626caa9376bcfabd722e6256484550ea1fd SHA-256: 769f191b89d71d9ba475c86c04c7142e70dda47fe86b3235532d030a8f00894e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to host and redirect users to malicious payloads.

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://xajibur.ru/award?keyword=reformas+borbonicas+sociales+pdf PDF link annotation
    • http://rolorutebu.sportsontheweb.net/kifefowibapukefatadi.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/biluzijumekof.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/december_2020_calendar_printable.pdfIn PDF document text
    • http://takaweri.mywebcommunity.org/bosotemikifaku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://larotusen.rf.gd/wesimi.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/nodirijiloropijo.pdfIn PDF document text
    • http://niferutabir.epizy.com/download_mu_cv_p.pdfIn PDF document text
    • http://wegajovekesowor.epizy.com/nuvovasufi.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_82f6b49dac8b4342ba2cc1c5dbd0ae59.pdf?index=trueIn PDF document text
    • http://legibevisavu.epizy.com/50712006428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb000570-3d20-4df4-b6ce-5ed6d13cf79f/biology_textbook_9th_grade_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca89587-b7e8-48cf-9d40-dd96bd95373d/ziwowuwusikowijusisowe.pdfIn PDF document text
    • http://wadarudi.epizy.com/organic_compounds_containing_nitrogen.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/todanakolonigatugaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19974304-4022-4846-9292-d192eb40d490/lonemezopemabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdfd3cd-17b7-42c3-9eca-f1321334e82a/streetcar_named_desire_movie_vs_play_ending.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_516d0f24700d4fe09f342c898886627f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/96048127842.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/spoken_english_through_tamil_simple_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c9bb9a-c6b1-41c7-a3b9-a980782bb2d3/wupuvadajubalu.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/space_oddity_bass_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ed6523-0162-404c-87b9-ef16660d17d5/dd_warforged_player_race.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_off000163b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B5 5448 bytes
SHA-256: 3800c10f1ce79f70799329ab13056f1c25bd235f147c27bd72a9478dd55aee3b
font_01_sfnt_off00017627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17627 13052 bytes
SHA-256: 8413f5094da73004856e15ff81f8b3bdba72517a7fe2b852c4f2cf1b3da39d41

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