Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5075a458b0a253f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-25 17:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ef2b8dbd9b85e5fac9720a7825b0e475 SHA-1: ab96b0e75e7b683dbd0eb948fac678e6fe874584 SHA-256: d5075a458b0a253f14aa35b5aa9fe824907c7d6154bfd4c8272420111f01aa62
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, suggesting an attempt to obscure malicious destinations or engage in SEO manipulation for phishing. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/award?keyword=basic+electronics+engineering+pdf+ioe PDF link annotation
    • http://vuvisopubalakur.iblogger.org/19658468816.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/jpgiie4/bupezurula.pdfIn PDF document text
    • http://vuzeliligovitu.iblogger.org/37827294842.pdfIn PDF document text
    • http://sitajejo.22web.org/capitales_de_tous_les_pays_du_monde.pdfIn PDF document text
    • http://vafijevimam.iblogger.org/25606356225.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/cNidjgO/com._happy_chick_emulator._app._for_android.pdfIn PDF document text
    • http://bunutib.mywebcommunity.org/genetica_medica_essenziale.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/eifHgg1/leselatapofevojupiwidedeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_67836a8984fe49928dd8dcf05c35f2de.pdf?index=trueIn PDF document text
    • http://tofarogupa.rf.gd/43917573941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27bb4350-1a98-41eb-a2ef-481b23ca0507/zutakafarimakegubisiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c16bf0a-1727-4d0b-b999-59cf6f95e70d/how_many_years_does_a_trane_air_conditioner_last.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_c5cac314433541b38bfcad9ca5fde009.pdf?index=trueIn PDF document text
    • http://rexawisoza.epizy.com/33719567431.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/acrobat_reader_dc_reduce_size.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_4fcdaa09863248869c988bd134ad7a81.pdf?index=trueIn PDF document text
    • http://zovimagad.rf.gd/development_of_african_historiography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f35544d-23a5-46f4-93d9-7fa3c2e155e5/fiforujinemefaladulo.pdfIn PDF document text
    • http://besevinoferoza.epizy.com/95021873892.pdfIn PDF document text
    • http://bidodabamurof.epizy.com/pisciculture_carpe.pdfIn PDF document text
    • http://dubanexotokegel.myartsonline.com/cadet_pilot_interview_questions.pdfIn PDF document text
    • http://duwagisu.epizy.com/2018_dodge_challenger_sxt_plus_owners_manual.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_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 5372 bytes
SHA-256: 8ec4712477b9f622f11833663da50b167957dadb22e4ae9b05a414acbb8153d1
font_01_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 11360 bytes
SHA-256: 0cd1cbcbe9305d6597d5f78db837a19dec2a2358f7968b56e33c8e35db5d3e81

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