Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1691617cea890d8…

MALICIOUS

PDF

76.2 KB Created: 2021-06-13 04:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0abb2a18f36b4e207af0e13e66a97541 SHA-1: c7e24f36115f6e87674b8c13d3699fdf13f1d8c7 SHA-256: c1691617cea890d85eb01b1a5197bc0467004e14ae9fc44f9e48269753787772
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick the user into clicking a link, which is further supported by the presence of an embedded URL pointing to 'pistant.ru'. While no scripts were explicitly extracted, the PDF structure and embedded URI are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pistant.ru/pbw?utm_term=executor+for+scripts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480383/normal_60638988bc490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_6053d75c19add.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465914/normal_5fdfabf850880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5fddd3122dfa2.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/ac913467-f5d8-46b4-aa24-2aa2646f738d/lol_surprise_card_game_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4662879b-69c9-48bc-a682-612f6b820fe5/mini_militia_unlimited_everything_old_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f75713-2820-4050-a9b7-b9d3be7bee6c/dutirawavagarorix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebe5616-e9e9-49d8-9df1-850bed61a94a/how_to_describe_listening_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b5791c-2e0e-44f6-a48f-46ffda2a7dc3/91212419803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dddd7b47-19fc-4a22-b503-8bae158c7b12/what_is_the_average_salary_of_a_computer_engineer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a6aa0d-c42b-4de7-85ad-720ab9ed57f2/51561820697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2135a1dc-a55f-42e0-a1bd-ddb827383b08/63021587343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b94ece-8e8d-4dfc-9f0d-40d4db28cadc/jivemenasefujexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b264785-f319-4e5d-b7c5-f2e213d6ce9c/how_to_brighten_up_dark_bedroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78cd21b-902e-4dec-afbf-5241f5dacfea/pulixoguxifagejitufur.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 4792 bytes
SHA-256: 3494889f88b4503ca78919fb064fbc48ac2038070325c4a6769d8d3ca03d2148
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 11252 bytes
SHA-256: 844737a154bf6aa041fa16c206e5ef5eacbdf294ff8501ae6a64746856e34bae

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