Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76435a89549b375…

MALICIOUS

PDF

72.2 KB Created: 2021-02-21 11:03:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 19fe4065cb2e3d2ecf2621a65e24b983 SHA-1: f81f6bfc54694d0eb034208a15fa86c8443864c7 SHA-256: c76435a89549b375718bed3f320225c6a00b87e2f44c833ea435e2207b2a2f55
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'https://jottigo.ru/123?utm_term=polder+scale+troubleshooting', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a 'Polder scale troubleshooting' theme, indicating a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://jottigo.ru/123?utm_term=polder+scale+troubleshooting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485702/normal_601a04cac4b4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415326/normal_5febd043cdefc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fc6cc6ba054e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5fd37bab81874.pdfIn PDF document text
    • http://drilltech.info/zesowatakoka3r1hd.pdfIn PDF document text
    • http://alcozerox.com/xusizelenakukipukodegabag7wcdi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_5fe8b8fc73248.pdfIn PDF document text
    • http://kavuxolabazili.iblogger.org/73281889179.pdfIn PDF document text
    • http://sparzha.club/xedolomagebogulofevinosib7f06i.pdfIn PDF document text
    • http://creditreportusa.info/bachmann_big_hauler_manualfxp2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/printable_brain_teasers_worksheets_for_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/rawebudavegajobulawabusuv.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/nusenolarafixowabo.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/wenuvapiderodizaxo.pdfIn PDF document text
    • http://laganomezavarof.epizy.com/80522773231.pdfIn PDF document text
    • http://garulolit.rf.gd/xamarin_forms_binding_property_not_found.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/90517959936.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/anti_terrorism_training_post_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/chalice_of_opulence_gear_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/fisher__paykel_dishwasher_dd605_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/molekozakabikufajodag.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_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 5340 bytes
SHA-256: ad631783f0efb981d6595fd44022f1ae27ab819fbd577e0f9d8b952c22d390a6
font_01_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10236 bytes
SHA-256: 661a5e2755ec622e4c892f0a35e986a83abc848e8f6059100e41d7353cc0832b

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