Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b50b8d94e5f6d9…

MALICIOUS

PDF

76.7 KB Created: 2021-03-15 03:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6fdb38a28066c492feb84c96b5c16a5c SHA-1: a8e75460d9a9b929aa13d98fe9e8390cbbd916f2 SHA-256: c0b50b8d94e5f6d9b51881bb3eeb479a3ab84f0de6f519def530a46807809ced
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to job applications. The presence of external URIs and the link farm heuristic indicate an attempt to direct the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://kuzutuzo.ru/123?utm_term=teleperformance+masinag+apply+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494681/normal_5ff8c7b78c1e6.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/fcgiIia/chicken_gun_mod_apk_1._7._2.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/ugeHie9/goluzazosifawofomojejaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/tadanopi/ptLwVji/tulane_environmental_studies_major_requirements.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_6031b085195e7.pdfIn PDF document text
    • http://vizoxusajozigu.iblogger.org/63415845082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_6040f1626e8af.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/Xu1UXgf/mimuziruravezigegesosamow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_60223c524639b.pdfIn PDF document text
    • http://lirenafu.iblogger.org/buwiwagovagozazel.pdfIn PDF document text
    • https://cdn.sqhk.co/tokokoxisuf/nbG1MnY/aggiornamento_android_tab_2_10._1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_604325bd6340e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd59b44-392b-4141-8d34-65cf9aee7e9f/que_tamao_es_una_foto_carnet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0799d1-24f7-4649-83ff-59355e34350a/6421744728.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/free_voicemail_app_for_android.pdfIn PDF document text
    • http://xutulatovemi.epizy.com/loluxufadugenewadasat.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/48109117374.pdfIn PDF document text
    • http://xuwunokebisul.rf.gd/bulava_teri_yaariyan_song.pdfIn PDF document text
    • http://dezezefisimel.rf.gd/zitufukaked.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/white_and_rodgers_thermostat_manual_1f80-361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb16920-fe51-4489-9018-8d5a4a90aedf/fases_del_proceso_de_investigacion_cualitativa.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_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 5388 bytes
SHA-256: 7e68a7d1069cd1a74e88a2cde1e50277d097a714bb92a56ffef54852a8311fcf
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 10612 bytes
SHA-256: d637faae96c5a0883d8af97745486038853b4fdef8e65d81e221557854d6fbf6

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