Malicious PDF — malware analysis report

Static analysis result for SHA-256 077f05348d555799…

MALICIOUS

PDF

78.4 KB Created: 2021-04-01 15:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4ee124e0e3057b12cff0cc7a02a351c6 SHA-1: f3433f0e90b4fc9386b28b6bbf1139143adb17cb SHA-256: 077f05348d55579968216131e66522351ea7ff8de3105a796555a260a2202eda
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains an embedded URI pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded links suggest an attempt to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://zajinet.ru/award?keyword=building+iot+with+raspberry+pi+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374859/normal_5fc59ca2db996.pdfIn PDF document text
    • https://vexofemefenulo.weebly.com/uploads/1/3/4/5/134594555/9e6205c9e13e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_5fd76f4c48284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452850/normal_5fcbd09a396cb.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/cjgiadV/samurai_robot_car_transform_robot_wars.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/gi6gehh/lipuxawefisabebagodefu.pdfIn PDF document text
    • https://pexasuwen.weebly.com/uploads/1/3/4/5/134593650/9470153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_602981ec9cb9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_606552cbce496.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/ihjjgiW/1448323754.pdfIn PDF document text
    • https://faxegosesu.weebly.com/uploads/1/3/4/5/134528451/pitulifiz.pdfIn PDF document text
    • https://cdn.sqhk.co/vinikawikuve/gyhbhhI/td_auto_finance_canada_contact_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_6010a47967885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_d7a5a8e03fab450ebca556374cabb274.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1aded27-def9-447b-82f3-d8f9614f8be3/cisco_ccna_200-301_practice_questions.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_c92d41d41a1647e7be886fe43c410520.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1a76a2-cd78-4312-8e00-fa4155298e36/community_service_requirements_for_delta_sigma_theta.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_a175a5d28f1f4c098faacf2ae8f84266.pdf?index=trueIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_b3ea54e116b2454bb12dda3fe450cc6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebbf5c8-0eed-4739-87c2-935157c52bae/kuvozubur.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_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 5688 bytes
SHA-256: 4921f513dee8a5d72ca699c3db26cd914b75bf3e281714ee1398f61d1fb36244
font_01_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 10568 bytes
SHA-256: 83df9654ae0c052acb1821ad82a48b010e9e32bc3479be0caf61de3c2d42ee33

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