Malicious PDF — malware analysis report

Static analysis result for SHA-256 81617fd5692878ba…

MALICIOUS

PDF

70.9 KB Created: 2021-01-24 11:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2654d05af1c5ab6e445ea79ba9e43155 SHA-1: eed77d09580be5b95f2c80c122b20ba6d7d0bf2e SHA-256: 81617fd5692878bacfa1b5e490b18c67e2abe882356928cbd0a15e82304709bb
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'traffset.ru', which is likely a malicious domain used to host or redirect to a secondary payload. The document body, though heavily obfuscated, suggests a lure related to spreadsheet applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/aws?utm_term=introduction+to+spreadsheet+application+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373502/normal_6002e8a0b230f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462351/normal_5fd7b137a1fdd.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/ohggfsS/firestorm_air_hockey_manual.pdfIn PDF document text
    • http://gratoram.site/292614691361p59d.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/ghajbib/bounce_back_email_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413843/normal_5fe458c8c8bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_5fe7a2582bc34.pdfIn PDF document text
    • http://detonic-ro.website/11149543630htkp7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_5fd2a6f1d228c.pdfIn PDF document text
    • http://5gusevshop.space/togiwol4mhqn.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzededoz/hhbKZjj/gezawiwurabikizuwire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462059/normal_5ff0dcdb416e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_5fd6751269eb3.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/Uihahdi/zowamumud.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/mizeteb/skype_desktop_application_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/nj_mvc_vehicle_registration_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/bajirao_mastani_film_in_tamil.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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 5180 bytes
SHA-256: 19fda7b0eb42d73b96cb6576a5864cd09ba41540116fe1fd775a4acad0990f31
font_01_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 10116 bytes
SHA-256: af176c7e2d01255b978ec378caa9e49d70a25a21ac4097974f1eeb134e08c94a

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