Malicious PDF — malware analysis report

Static analysis result for SHA-256 668a8796895f6464…

MALICIOUS

PDF

67.8 KB Created: 2021-01-17 18:55:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 20e85b7132664e1ea913e0b10126316d SHA-1: ef1826dc4052c9ffd687200622944d9c475a6b47 SHA-256: 668a8796895f64648a4cd51ece7052a9c8648b2c8d2d7e7c85082d08bcb27976
214 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific URL pointing to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to trick users into navigating to harmful sites.

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
  • 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://gettraff.ru/123?utm_term=skeletal+system+worksheet+answers+there+are+around+206 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480588/normal_5fcf9ce249fd3.pdfIn PDF document text
    • https://zosetujisux.weebly.com/uploads/1/3/4/2/134266291/92b75a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fbe710c3c440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467589/normal_5fcccc2d6799a.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/0ichgLN/pitufigidoviji.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/ahIhaty/alpaca_world_hd_redeem_codes_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_5fd8e1d53b266.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/VXY3scn/74166430804.pdfIn PDF document text
    • https://xovixonu.weebly.com/uploads/1/3/4/8/134896571/jupojul_dosegaxubefefun_doroxusiri.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/fewifuwu/97907361219.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/influence_of_art_on_society_and_culture.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/brady_wire_label_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/possessive_adjectives_exercises_multiple_choice.pdfIn PDF document text
    • http://xulelaperimiku.epizy.com/mezarofisavokisik.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/frequency_table_worksheet_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/black_ops_4_zombies_classified_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/hosting_the_presence.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/74190790010.pdfIn PDF document text
    • http://melaworogafema.epizy.com/41170955219.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_off0000cd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD28 5852 bytes
SHA-256: fff6132aeb2af9481d6acdd284f1f8f02b7f8fbc997429a64770c5441ad85e43
font_01_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 9552 bytes
SHA-256: 83b173b87f3af6de554aa170947b15c791975fdbfdad0de3b89a3457032815d6

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