Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77e1c032fafb9c8…

MALICIOUS

PDF

73.5 KB Created: 2021-03-06 13:21:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ac50a0e7e3e952b250b0963251259252 SHA-1: c7dead3f1764308fc7265744098fdcc68e6319fb SHA-256: c77e1c032fafb9c836db0fb1ab9bffb570fcfddda1c4c606c7e1b030a443c27b
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with many pointing to disposable domains and link farms, indicating a phishing or scam attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites, aligning with spearphishing tactics.

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://jacksth.ru/award?keyword=how+to+design+a+board+game+pdf PDF link annotation
    • http://tozofuji.scienceontheweb.net/79419519749.pdfIn PDF document text
    • http://operationhomeplate.com/the_bell_jar_fig_tree_quote450i1.pdfIn PDF document text
    • http://prodson.fun/how_to_charge_plantronics_voyager_legend_bluetooth_headset23xwt.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/free_isa_arborist_certification_study_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_60186a3ae2c58.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/93890831084.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/fonaruvitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_604012adbacbe.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/15045779253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_603510aeebc0f.pdfIn PDF document text
    • http://imkl-checker.com/gefobefiritovanalo3jv3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5ffd51526584b.pdfIn PDF document text
    • http://leomannapov.com/kepagezajgi60.pdfIn PDF document text
    • http://ejqy.com/42798236680n5f2g.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/girl_scout_yells_and_cheers_english_lyrics.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/best_veronica_roth_books.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/41077942654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_603f73fc44dde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tevefetilojas.atwebpages.com/matuvuvigikowomigu.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/how_can_i_reduce_my_dish_network_bill.pdfIn PDF document text
    • http://pimobepetokonud.myartsonline.com/kenmore_350_series_water_softener_price.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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 5524 bytes
SHA-256: cb24b7870c1860af78a3f1d5b9e689a985cd8fc743c896047c1af5029d4a27c1
font_01_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10940 bytes
SHA-256: 5e89f4415d72c5270c02467db5fd114bcf6552849b4138468fcbbc27e0dfd5f6

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