Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfd641787190140…

MALICIOUS

PDF

77.9 KB Created: 2021-03-12 05:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: effbd677978e13d1ebb3750536f63d19 SHA-1: a989df57122edd7dbba60c4264cd962f3f481a14 SHA-256: 0bfd641787190140c16f545eeb4c7eedb0a570da743987a343050ad5bf50afee
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a failed attempt to disguise the nature of the PDF, possibly as a search result for a workbook.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/award?keyword=emotional+abuse+workbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486552/normal_5feb93f4b471d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_601371a77c512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490735/normal_600c59d699e1d.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/sumesawoxajew/baaghi_bhojpuri_full_hd_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e165956-a988-44fe-a64f-16cc752703e7/zipupalalenumofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee99a54-591a-4214-9172-1ffa2b6080e0/diablo_3_switch_eshop_sale.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/69166914604.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/compare_and_contrast_essay_topics_for_university_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3201efb0-13d6-483b-9324-97ac12cad60f/how_to_answer_ethical_questions_medical_school_interview.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_0be4af023ca54d468fbe8f8edfd5f9c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwosil/beat_saber_android_vr.pdfIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_f5edf7d37a654639a2c9cbf8cbd26b79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e17fadb-98e9-4cd6-8d70-060b3da0272e/81728149012.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_d290903e213942d88ad0f3921738247c.pdf?index=trueIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_ae804e586cb44b2ea2e2dd6eeec38103.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/understanding_the_linux_kernel_book.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_7830772cd05e44789b7f25b30dab484e.pdf?index=trueIn 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_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 5324 bytes
SHA-256: 63a94e0b9b564e2c8db2dc28f236a1b04524e4369d3d5ff3e53332a9bb7a5087
font_01_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 10904 bytes
SHA-256: 0bb41074ac96f918e2bd7129676c99fe70c71466ea0298985e2988c0d4f65373
font_02_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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