Malicious PDF — malware analysis report

Static analysis result for SHA-256 b375d12d5ab7e77f…

MALICIOUS

PDF

77.7 KB Created: 2021-04-10 00:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2498d55ff5d09f64fabe7c5602b30842 SHA-1: eb160cecf8b970263a4ab17ade08c75e7c2c733e SHA-256: b375d12d5ab7e77ff47b3c0d047b82b5771bef95ee91a9123038efb561bfbdf0
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. An external URI pointing to 'fokemale.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains text related to school uniforms, likely a lure to disguise the malicious intent. No scripts were extracted, but the presence of an external URL and the malicious verdict strongly indicate a phishing or malware delivery vector.

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://fokemale.ru/strik?utm_term=high+school+students+should+not+have+to+wear+school+uniforms PDF link annotation
    • https://cdn.sqhk.co/papazokixe/ZxThgjb/89822033066.pdfIn PDF document text
    • http://onlinekartiadesi.com/dibasitoligituzm1whi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_6058a0fd269d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_60549dbcced9e.pdfIn PDF document text
    • https://cdn.sqhk.co/tipapija/s2lifZv/title_page_of_a_report_example.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/Mhjjcje/740711259.pdfIn PDF document text
    • https://cdn.sqhk.co/repejuvovod/NXjhasC/75976163162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5fdbacfa5a171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_600fbf3fb9de3.pdfIn PDF document text
    • http://private-channel.site/tudizuzegotalukafujusowovmueg.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/galinikagopit/how_to_get_good_at_drawing_hands_faster.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_895064b0e39b4f39827531be44b0aa04.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_49a7d573cf7741648f56ec0a4e2099d3.pdf?index=trueIn PDF document text
    • http://nowivopikuzud.epizy.com/guardian_quick_crossword_answers_15010.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_f22057574d1143fcbbb6ebbbf4746595.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukazowox/87374909272.pdfIn PDF document text
    • http://jerasopel.epizy.com/57491012023.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/mhgen_insect_glaive_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/57124431147.pdfIn PDF document text
    • https://9e4d96d7-92f1-4145-9aac-d1976e75dfe6.filesusr.com/ugd/49a98b_466b75e578f844a5b7a328602c99e64a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/how_to_format_bootable_pendrive_in_mac.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_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 5548 bytes
SHA-256: 094b9b3aec885f2c38213fe9e2f593144d059f9b627cb34444d05b204f510bc6
font_01_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 11584 bytes
SHA-256: a344c0ae2713afe0f11ce6a455f1eb171a5113ec1dc9d8de951c76804f8fc10a

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