Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf90c4cf742883fc…

MALICIOUS

PDF

78.2 KB Created: 2021-04-04 19:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 181d55b52dcbc9eafc56b67f570fe081 SHA-1: c8bba571f4ce46d144f5ff984c237b740c99e842 SHA-256: cf90c4cf742883fcb3899080ac02e04190ed1dfe8380169c8de1db8f09abb971
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm, 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 malicious document designed to redirect users to potentially harmful content.

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://druttle.ru/wix?keyword=mathematical+statistics+with+resampling+and+r+pdf PDF link annotation
    • http://teenagetutor.net/31941848140a0dmj.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/jAhdiez/kokexelekujurutakewe.pdfIn PDF document text
    • http://zitukuwekoba.sportsontheweb.net/swing_components_in_java.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/adding_and_subtracting_rational_expressions_worksheet_with_answers.pdfIn PDF document text
    • https://bopegaxuz.weebly.com/uploads/1/3/1/4/131406849/7538168.pdfIn PDF document text
    • http://tevfikyuce.xyz/tixovitisezoxxh552.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/jM1WHxb/tokis.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/ttulos_de_crdito_direito_empresarial.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/fQggiif/41428180338.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/0d865c7f21367b.pdfIn PDF document text
    • http://alluniversity.fun/61727212962mqpci.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/HiaLibT/zombie_hunter_sniper_apocalypse_shooting_games_hack.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/91494199838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fetopenatafef.rf.gd/82851123404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d171e7dc-00c7-413b-b77e-cfbbfec98fa8/what_does_chlorophyll_produce.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/geometric_progression.pdfIn PDF document text
    • http://sarozaxag.epizy.com/assignment_abroad_times_mumbai_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ca3f87-c987-4b23-bc82-6b11bd972896/reretikaniwubezonolikija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/747befb8-1c66-45be-bfd3-d021defbfa6e/atlas_copco_compressor_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e718e39-2cca-45fb-a4e9-1777ed370338/photoshop_classroom_in_a_book_2021.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_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 5668 bytes
SHA-256: 8c6b2e78f4fcb97c4b3379caf2b5d499ceca0b1c44c0ae37ae2109375d0d7e8b
font_01_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 11544 bytes
SHA-256: 88fe93cb86ee996307fbfdcd13f5356198459228a4c95de81c21ee8e5ac7c207

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