Malicious PDF — malware analysis report

Static analysis result for SHA-256 963b8e7eb1ba9ac9…

MALICIOUS

PDF

75.8 KB Created: 2021-03-08 07:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: be5cefc3cea47bb13ef5ea3df62a703f SHA-1: 7ade4e6c8767cfacf1977fe7c49ac8e61048f466 SHA-256: 963b8e7eb1ba9ac9a7ca41260d59a720c414732d953a444f3460ddf7e324e359
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://botokaw.ru/123?utm_term=how+should+you+stretch+before+lifting+weights, is flagged as an external URI. The ClamAV detection and ML classifier also indicate maliciousness, specifically classifying it as Pdf.Phishing.Trojan. The presence of embedded JavaScript, though not fully detailed, suggests potential for malicious scripting to execute or redirect users. The document body is heavily obfuscated and appears to contain metadata rather than user-facing 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 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://botokaw.ru/123?utm_term=how+should+you+stretch+before+lifting+weights PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418984/normal_604506a273cb3.pdfIn PDF document text
    • https://xijadetula.weebly.com/uploads/1/3/5/2/135296157/jegelowuvinun.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/4510285.pdfIn PDF document text
    • http://copyright-securityx.com/zizotolajifarhk19.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/another_word_for_visual_learning.pdfIn PDF document text
    • https://tazizepi.weebly.com/uploads/1/3/4/4/134439401/kozigaruzutotu_mitavodasabunu_sadega.pdfIn PDF document text
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/cc737c4e37.pdfIn PDF document text
    • http://nuveclovet.xyz/direct_and_indirect_calorimetry1opuh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454803/normal_6019c3ac5ff56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_602292d5860ea.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/jafosogulubuse.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/vazisi/hydralazine_hydrochloride_davis.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/basara_ppsspp_freeroms.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/private_vehicle_bill_of_sale_template_ontario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4415e6-60fa-49af-8a48-39cebd2dc163/unit_operations_of_chemical_engineering_mccabe_smith_7th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c08a766-7924-46ea-8111-45a4681d8118/where_to_see_cactus_in_sedona.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/47740786290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b76683-f029-4388-9589-c307e5226577/insurance_company_safety_ratings.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_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 5368 bytes
SHA-256: e8aae9e551f39bfba91064f3e1839b3a528081829aef63ebb1a09d1ec3029cbf
font_01_sfnt_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 10324 bytes
SHA-256: 59f5faaad8caa6bf04bfbec43331d73c8d7eb7d31eac2409f055b52d6bf5465c

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