Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf97416c7f363110…

MALICIOUS

PDF

99.3 KB Created: 2021-04-19 08:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d2e1eeefcb8756df53a48437ca8e82 SHA-1: be988de2b1acabeb1ce0711bf7408cd729d53a6e SHA-256: cf97416c7f363110dccf8f06af03fe7dae082f4f7a72cd0989fc5f96b7369a98
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=the+things+they+carried+summary+chapter+17
    • http://meetraisins.club/review_of_the_stand_cbs_all_accessltnij.pdf
    • https://cdn-cms.f-static.net/uploads/4501046/normal_602ee4fc98e2a.pdf
    • http://amst-watch-v2.club/how_to_do_neck_rotation_exercisev5wde.pdf
    • https://cdn-cms.f-static.net/uploads/4463791/normal_60403bc7514f9.pdf
    • https://cdn-cms.f-static.net/uploads/4403960/normal_605bc5a8a0ddd.pdf
    • https://cdn-cms.f-static.net/uploads/4375356/normal_6055c0ec9d439.pdf
    • http://mofozojenanavub.iblogger.org/diagnostic_interview.pdf
    • http://rokamawu.iblogger.org/secured_to_jpg_converter.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_bf91d0c203fa40c8bf4c58a49b10964a.pdf?index=true
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_43dfcb87b4c44635906cb9d8690174df.pdf?index=true
    • http://tunivepusage.epizy.com/alter_ego_french_a1_answer_key.pdf
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_e39c911c535b484787a8fcd0ac1d9ab8.pdf?index=true
    • http://jeworobe.rf.gd/cardiologia_pediatrica_gratis.pdf
    • https://s3.amazonaws.com/jedobufudajewu/how_to_wear_sony_mdr-xb50bs.pdf
    • https://s3.amazonaws.com/fedure/wijas.pdf
    • https://s3.amazonaws.com/fogibi/lg_tromm_washer_wm2277hw_manual.pdf
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_36fa17323eb7458a8d0d6a3d77641c5a.pdf?index=true
    • http://turegipamikum.epizy.com/finativokexof.pdf
    • https://s3.amazonaws.com/zuwimadaneb/sims_3_exchange_add_to_game_not_working.pdf
    • https://s3.amazonaws.com/jazofi/54932606486.pdf
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_66ec41097a6f4c1fa2c913a2f2c3fa31.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d4437ef0-b4e6-4375-8ad0-aa8e8c6493f6/what_are_the_three_reasons_the_renaissance_began_in_italy.pdf
    • https://uploads.strikinglycdn.com/files/eb9f66d2-77c2-4b7e-836a-6b4455790303/8906277049.pdf
    • 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_off00014595.bin
a06acf0eb943655833027abdffc008efe08eaa220b75f3f263fed1462b47c087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14595 5640 bytes
font_01_sfnt_off000158b4.bin
232c5d8f0588dbb81977a80168e60ebbc3acb66e712191318c1cde66d65c32e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158B4 11424 bytes

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