Malicious PDF — malware analysis report

Static analysis result for SHA-256 641db4590cce9541…

MALICIOUS

PDF

91.4 KB Created: 2021-05-02 10:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0b38988b5fe49c1e987655e9d5c9b57f SHA-1: 692804eb08476f02b3f6063a8f77fed65177e3af SHA-256: 641db4590cce954181fd53f045512a92df37d204d6d1edf2281aca40a3abde80
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, a common tactic for SEO manipulation or phishing. The embedded URL points to a suspicious domain, likely serving as a lure or part of a link farm. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=does+akira+like+amon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419832/normal_60069bebdc8f5.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/jdieFjf/ba_first_year_education_books.pdfIn PDF document text
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/guvifamaxifojo.pdfIn PDF document text
    • https://vitozosusa.weebly.com/uploads/1/3/4/7/134727909/92a4207142f40b6.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/singapore_airport_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_603c854bd9e20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_605ef5dd2c03e.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/2e4a3afe30.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikeraz/rnEie0j/alaska_biennial_report_online.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/bazebin.pdfIn PDF document text
    • http://wubujonil.getenjoyment.net/falobo.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/monthly_household_budget_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_60413975203fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_606e0d3bd5eb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/metakibeme/castle_rock_state_park_map.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/ooh_child_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/veraxojizolividotovenod.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/tupawomumovokigowujokabi.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/40351157912.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/web_camera_online_cctv_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/85738573844.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/11611923523.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/channel_4_on_demand_android_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 4616 bytes
SHA-256: 2166aaf5151fc08551333844be813188f40212a0c8b3a50eb879a5bc26ad2c09
font_01_sfnt_off00011eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 4896 bytes
SHA-256: ff6aee44d3439b45a6671c630aec7df8cc0fefaad2252068860f9d29f1541a1f
font_02_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 15956 bytes
SHA-256: c322b6505d8b8cafb8d1ffa570043f96f4e8e6a5c4e00110c688337529eba9ed

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