Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c26df10b411233…

MALICIOUS

PDF

71.5 KB Created: 2020-11-17 11:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 38f568ac26200a6de7f01f6e547d4883 SHA-1: bf3bd2cbfa562a9d586709722f90dbfa1acc3b14 SHA-256: 71c26df10b411233fb8cf6d94aec5a8927a004f990bdf6a27baf8dc0641963d7
214 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically identified as a malicious redirector. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=what+are+the+main+advantages+of+industrialization In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_5f99bb59d7bc0.pdfIn PDF document text
    • https://lakujasoramaw.weebly.com/uploads/1/3/4/4/134400634/tumokivoxaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5f99992048239.pdfIn PDF document text
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/140c0a.pdfIn PDF document text
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/rumuruturokoxezulob.pdfIn PDF document text
    • https://sezemizom.weebly.com/uploads/1/3/4/6/134622585/fetuliniva_fogewada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/21780361-dda4-4eb4-a735-e51fa553fba2/jonway_scooter_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/quickbooks_desktop_2020_system_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/fraction_word_problems_2nd_grade_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/94477113838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a164f04-fe45-4892-ae89-64b0852e15ad/69071297160.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/black_diamond_storm_headlamp_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157d5933-8692-4c1b-a57a-41fc2cab8701/idbd-_746.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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 5444 bytes
SHA-256: 2aaf6152a5f8840ee1981700eaff0c391f8b429d0a81f3ab62633549adc1afe0
font_01_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 10260 bytes
SHA-256: 086f8b0bfb42c06fdd375402efcc10d15f9291033ec7db4887391b184452a5c7

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