Malicious PDF — malware analysis report

Static analysis result for SHA-256 77311392a5c956a7…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 06:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f261a8e2cbe2bebf04956ae40653ec3b SHA-1: d3cadeddad8d8f782fa407a334d9d37f867d2928 SHA-256: 77311392a5c956a78a60733858ded3da103a0889a388655476a32b5f74aff045
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by heuristics as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/123?utm_term=anglo+zulu+war+mod PDF link annotation
    • http://sadesopawu.iblogger.org/53842479419.pdfIn PDF document text
    • https://wonuraje.weebly.com/uploads/1/3/5/9/135983109/d365533826190.pdfIn PDF document text
    • http://wulurag.mygamesonline.org/a_week_in_the_woods.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamujigip/6S6ibjc/89601414808.pdfIn PDF document text
    • http://suraneb.scienceontheweb.net/lalibapidovidajisowuzage.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/simple_cake_recipes.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/fumusafija.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/addition_of_dissimilar_fractions_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/vijamabaf/lfQgjav/this_war_of_mine_review_board_game.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/I5hjjeM/pokeball_plus_instructions.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/analysis_report_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/icwtIhi/bogigita.pdfIn PDF document text
    • https://fineruliji.weebly.com/uploads/1/3/4/3/134313455/8957420.pdfIn PDF document text
    • http://wudazex.sportsontheweb.net/katalog_ikea_2020_indonesia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_91863ad423ff4b3fb135eef530eced38.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_2ef214b3b1a24cdc8e7ac139341479de.pdf?index=trueIn PDF document text
    • http://jugomirusulove.atwebpages.com/sensory_evaluation_of_food_lawless.pdfIn PDF document text
    • http://janizopug.epizy.com/88775762458.pdfIn PDF document text
    • http://kuwixogup.rf.gd/saredizeruzejasenimup.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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 5100 bytes
SHA-256: 38f928fd016e537b57eb43293d217d3b5810867ab854ac10390b03af740bc87b
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 10924 bytes
SHA-256: da01c115862407dc57b80a3dc7bbfe88c8961a11a0929ec7c8c70fd7237969b3

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