Malicious PDF — malware analysis report

Static analysis result for SHA-256 c073a6fca30cd9c2…

MALICIOUS

PDF

88.2 KB Created: 2021-03-27 15:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2f2925eb716a748b347a0374561d86ee SHA-1: df2564b803862ac7abae8f0f75de79fdc27f2033 SHA-256: c073a6fca30cd9c24650eb1de6b21c351638ff21ca5dd10598582d084e348034
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The document body, though heavily obfuscated, suggests a lure related to 'Excel assignments for high school students'. No scripts were extracted, but the presence of many external links indicates a likely intent 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://jottigo.ru/award?keyword=excel+assignments+for+high+school+students+pdf PDF link annotation
    • http://vehicleinsusa.com/employment_letter_templatev8ib1.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/can_medics_go_to_ranger_school.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/osteoarthritis_adalah_usu.pdfIn PDF document text
    • http://erkutungotu.com/on_green_dolphin_street_lead_sheet_ebyr494.pdfIn PDF document text
    • http://dololebajug.scienceontheweb.net/paliz.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/41986960647.pdfIn PDF document text
    • http://ramidavukul.medianewsonline.com/posoxotolavinerir.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/tizix.pdfIn PDF document text
    • http://kihepc.xyz/xujovaxetanapawilev2g1fw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bivojeda.atwebpages.com/jovos.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/ccleaner_full_bagas31.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_12ef020cdd254d7f893b8a56aae0a117.pdf?index=trueIn PDF document text
    • https://90b39d6b-e2b1-4ddd-a6a5-7d4b4b1c93c8.filesusr.com/ugd/e2f197_a8dd54bccb6e4700985720a5c18fbf93.pdf?index=trueIn PDF document text
    • http://kofaxafogi.myartsonline.com/buzzword_game_cards.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/9479797618.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/dugulamavagadetimapul.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/38366315353.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/41498181373.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/how_to_change_profile_photo_on_iphone.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_d298bdab42734cad9732c78d8efb4404.pdf?index=trueIn 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_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 5596 bytes
SHA-256: 549404f2367480dac7c2bbad3b70de63b56eb7eeaf88710403633d3e229cfe8c
font_01_sfnt_off00012e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E26 11000 bytes
SHA-256: cc9d045d5c5ff967a0c1dbe92fcfa24578d63496e558ca984190cefc51e77465

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