Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f117348f31b26f0…

MALICIOUS

PDF

77.4 KB Created: 2021-02-16 22:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0d33e547e5698b9956f66475e727b8c1 SHA-1: 33a2a37c2f82fe60a4595f159879c8b3284a91a2 SHA-256: 5f117348f31b26f03a9b40c42c408f745144a578242b877bd885bec604ab8ff4
166 Risk Score

Malware Insights

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

The PDF document contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/wix?keyword=texas+regions+worksheet+4th+grade PDF link annotation
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/libipuros.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/Hifjeib/44116914135.pdfIn PDF document text
    • http://padlamadla.site/syllabication_worksheetsu7kuv.pdfIn PDF document text
    • http://optarfes.com/adverbial_phrases_ks2_sats828cc.pdfIn PDF document text
    • http://pejibapu.iblogger.org/software_development_life_cycle_and_agile.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/1631224.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/BjcGLhe/rakiv.pdfIn PDF document text
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/borotinobi_rugubebide_saraxe.pdfIn PDF document text
    • http://1gusevshop.space/temebuguweceus1.pdfIn PDF document text
    • http://frukt.fun/find_my_phone_free_app2pbxz.pdfIn PDF document text
    • http://fizolewafivemis.22web.org/mayespark_primary_school_ofsted_report.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/ihc2sia/3d_tennis_mod_apk_download.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/kudufigunabi/janufitam.pdfIn PDF document text
    • http://lojupodinitaxug.epizy.com/37550940553.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/start_android_emulator_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/vibiwaganuzojom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 5104 bytes
SHA-256: e26ad5e7523dd8863be0429d69235c34122bf66a4f08ebce6dd4ced6fb279284
font_01_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 10680 bytes
SHA-256: 586d12cb85a833490dabbbf703abae1503a728753a682d45635c36f520fbc184
font_02_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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