Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddbac8916c19533…

MALICIOUS

PDF

77.9 KB Created: 2021-05-08 06:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 08da4186f3291bdb833d611e8c884fc9 SHA-1: 92230c8c41ba94f52787cee813f4a5fce9c7d21c SHA-256: bddbac8916c195332ca168689d28c0cc5eed9eb3341266cb7d8025d864dce36b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, suggesting it functions as a link farm or a distribution point for malicious content. The presence of external URIs and a link farm heuristic points towards phishing or malware delivery. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=do+holmes+air+purifiers+emit+ozone PDF link annotation
    • http://korixoludofuguk.scienceontheweb.net/english_lesson_plan_d._el._ed.pdfIn PDF document text
    • http://xegisepereti.mygamesonline.org/73575111389.pdfIn PDF document text
    • https://cdn.sqhk.co/magimoruki/giehigc/75948488774.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/eo7ijw1/6283149208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458625/normal_6014bcf499860.pdfIn PDF document text
    • https://cdn.sqhk.co/vizejagojib/7geMkDx/20864092594.pdfIn PDF document text
    • http://rejamar.sportsontheweb.net/fetan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_602b3da9b0cab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_bae8b1e522754db8baac3dadbaaa3f62.pdf?index=trueIn PDF document text
    • http://mafokesa.onlinewebshop.net/tipuwetikojijonukibup.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/how_to_service_a_50cc_moped.pdfIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_389ae845e48c4a9a8238a393745a6e8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0885a2-1f7c-4ea7-b774-9b82080f61d0/rijupexodejanitonobi.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/74418148586.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_a9923928ad094febaca3338f5b8351ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb45615c-e91b-4525-9918-c7f96d431d93/56579822094.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_d01f4afb9d8148e0b01ba2bbf8313838.pdf?index=trueIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_2535b76f877044a7a251cf908f9d7cbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/home_cinema_2150_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/classifying_organisms_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518910a5-eddc-4373-a125-ad05cfce34cd/21642040493.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_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 5188 bytes
SHA-256: 7d9f2be5b427cd989699d1e86f166c674f4f43e261376c566e71a6cbf2106479
font_01_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 10680 bytes
SHA-256: cc3d5bf7ce6a56de8734f20667c9801e969acdd7e1abe7bc5582cc82efc41aca

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