Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c293d94a5101e0…

MALICIOUS

PDF

76.4 KB Created: 2021-03-20 17:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 962bb64f9d304f260a9dee68ab43ce60 SHA-1: 4d400a3f145af7688ec7e27221b1c83346795c70 SHA-256: f8c293d94a5101e0d4a12d08fed1b5dad87d08b55c4476fe82ee01d2e69df7fe
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or redirection scheme. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs indicates an attempt to direct users to potentially malicious or deceptive websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=slim+boyfriend+jeans+outfit
    • https://cdn-cms.f-static.net/uploads/4379842/normal_60170bffb53d8.pdf
    • https://cdn-cms.f-static.net/uploads/4393514/normal_6047f5bd1bdf7.pdf
    • https://static.s123-cdn-static.com/uploads/4459025/normal_6007538ad2a38.pdf
    • https://cdn-cms.f-static.net/uploads/4482230/normal_60342012465fb.pdf
    • https://cdn-cms.f-static.net/uploads/4390680/normal_5fe7db2ab6563.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wubavon.epizy.com/aggiornamenti_android_8._1.pdf
    • http://jefitanebigovun.rf.gd/fiske_guide_to_colleges_2019_list.pdf
    • https://uploads.strikinglycdn.com/files/d3a84fe8-8fc4-44c4-a1e8-7272ec142c1e/grohe_shower_faucet_cartridge_replacement.pdf
    • http://lavofedelozus.rf.gd/bolton_sixth_form_college_application_deadline.pdf
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_bb6f502198a849afa1ff55e82c7be281.pdf?index=true
    • http://tufelurokid.epizy.com/wobof.pdf
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_25ad4bff15bf4e10b939bbed48a5e06d.pdf?index=true
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_a6bdcf3975234f7eb82c038ba028439c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1a0055bf-0906-4ab8-914c-26ccd2fe11d6/juxeliruwonegewaxibides.pdf
    • https://uploads.strikinglycdn.com/files/63fb2bf7-8083-496b-aed2-000d5ad6ae0c/92557883227.pdf
    • https://uploads.strikinglycdn.com/files/e4ad2903-1077-4f4f-bfda-cee876343c9c/what_is_the_purpose_of_a_stockbroker.pdf
    • https://uploads.strikinglycdn.com/files/566f455c-92e4-40b0-b430-75c36adde954/54984805657.pdf
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_dc5793bb5ca64bac953cf6b172ffe6de.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11586334-7267-489c-bd57-fe19faabeb65/what_is_the_use_of_reference_voltage_in_adc.pdf
    • https://uploads.strikinglycdn.com/files/9c22a1a1-c1a4-4dbe-9875-b35ceb7c0677/how_much_was_2500_in_1960.pdf
    • https://uploads.strikinglycdn.com/files/bf4527f7-2d2b-41e1-849b-b98565a0950b/super_mario_bros_2_japanese_box_art.pdf
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_7b564e769c6242ca895529d976be84cc.pdf?index=true
    • 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_off0000eba6.bin
2bd560e04e216570e83ed35350104a59ae0acd078b51b2fc65fb1101da35567b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 5476 bytes
font_01_sfnt_off0000fe33.bin
c1c5ce97713ba3bde181ea59ffb5b26499c7126641410587b6ca13090f2d2a0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 11360 bytes

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