Malicious PDF — malware analysis report

Static analysis result for SHA-256 81add8f7b3f9c028…

MALICIOUS

PDF

71.3 KB Created: 2021-02-10 10:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 198d9871fed327c19e5826372d5e36b9 SHA-1: d1fab7edff372bad45c2af2b2c61c08c846a8fe2 SHA-256: 81add8f7b3f9c0280f74b9dd7d322423452f966325a5bbfb896ca9253d5e96b3
96 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one specifically linking to a search result for 'probability math test pdf', suggesting a lure to download further malicious content. The file's structure also indicates potential for embedded scripts, though none were explicitly extracted or analyzed in detail.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wb?keyword=probability%20math%20test%20pdf
    • http://alfa-quest.ru/culture_and_values_a_survey_of_the_humanities_8th_edition_free8g5hp.pdf
    • https://cdn-cms.f-static.net/uploads/4477921/normal_5fe6539be3211.pdf
    • https://furivupes.weebly.com/uploads/1/3/5/2/135295821/febimapeposom-jebabipibujiv.pdf
    • https://voruvodurumape.weebly.com/uploads/1/3/6/0/136012543/nujepuz-ribozob.pdf
    • https://cdn-cms.f-static.net/uploads/4418786/normal_60208b12998e4.pdf
    • https://cdn.sqhk.co/feripamapuv/igJTthg/54308362208.pdf
    • https://cdn-cms.f-static.net/uploads/4476443/normal_601dca6c49adb.pdf
    • http://hayatevesigar.online/philadelphia_eagles_schedule_20200f8nc.pdf
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/fapekisokera_wugegasuzum_ziruzevidi_revoxonov.pdf
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5ff3180987431.pdf
    • http://giftcard-sale.store/46018237598r6t7e.pdf
    • https://nesavelo.weebly.com/uploads/1/3/2/3/132303009/5061033.pdf
    • http://my-favshopg.online/5e_tunnel_fighterlfcvd.pdf
    • https://baripunasese.weebly.com/uploads/1/3/4/1/134131446/tuvivinokox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ba.bin
6c48b91871ec1aedc82a1937f4c52b7d5871ff5973a1c999422c8bd33fcabfb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 5524 bytes
font_01_sfnt_off0000ea53.bin
68602f9bfbb0dc6310fff3e2f171fcdf134a68d7db2fa05e99f6b9b05b07a270		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 11388 bytes

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