Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cda4725d23c5d56…

MALICIOUS

PDF

85.5 KB Created: 2021-04-21 19:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0eb6ddbd1fc4a7edbf5c92c8613096ff SHA-1: 42dca6a1e07fd36a8bc8ef413493f1dc5003d9bd SHA-256: 4cda4725d23c5d56e2b93e37dc069cc4f85733db4fa258eea57a49401bebd7e1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of external URIs and a link farm, suggesting a phishing or malware distribution attempt. The document also contains a visual download button lure and instructions for a password-protected archive, common tactics to trick users into downloading and opening malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/strik?utm_term=crack+steam_api.dll+virus PDF link annotation
    • http://rimiripa.mypressonline.com/60863518021.pdfIn PDF document text
    • http://ins.expert/us_fast_food_industry_report50667.pdfIn PDF document text
    • http://arevakar-travel.com/bukemakobomigg30dg.pdfIn PDF document text
    • http://xemakaze.mywebcommunity.org/zufelu.pdfIn PDF document text
    • http://mini-cam-v2.club/69764542378n4j15.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/40903915577.pdfIn PDF document text
    • http://senteber.site/sato_cl4nx_problemsyn2wy.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/how_much_do_entry_level_data_scientists_make.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/toyota_camry_se_2019_price.pdfIn PDF document text
    • http://uscreditinquiry.info/59743216951giizv.pdfIn PDF document text
    • http://itawomen.fun/how_to_install_ecobee4_thermostatdzzaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mubemutolewe/63249316694.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/hoover_power_path_pro_xl_gasket.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/bosch_exxcel_dishwasher_manual.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_a178d733c27b4be9adec6f4c10e2e67b.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_20398094da6d44da9fbb0cb7a1c9958c.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_73558cac0422452686692e661912e1a2.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_6aa1dceca2994fdcab749dff8d20dc4a.pdf?index=trueIn PDF document text
    • http://buzumigasox.myartsonline.com/zotabizotikeza.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/gedur.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/literary_device_definition_syntax.pdfIn PDF document text
    • https://2a04f01a-7147-4793-98aa-b59dc93e6f96.filesusr.com/ugd/efcdeb_0fb1eb3c7efc4451ab1730339dda5220.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/brother_mfc_7340_driver_for_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 5092 bytes
SHA-256: 400c966094880d3d91c6a7f64a8ec49c05d16315f128c6033d4c4cc0e7c85683
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 11592 bytes
SHA-256: 98a3b6507c5914e39291eff36c763b40c0748797d96428895f62aa28b8e1c44b
font_02_sfnt_off00012540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12540 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off00013a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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