Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8350f4841922917…

MALICIOUS

PDF

77.2 KB Created: 2021-03-14 11:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b37468a38e4b885e1be40702437d7d0 SHA-1: 9be58b4a02262439ce965b13f14d670feacfdc86 SHA-256: f8350f484192291705557751c155c4e017d6e945cdc31a8916f2f7e16e993cc5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/123?utm_term=pakistani+bed+sheets+uk PDF link annotation
    • https://cdn.sqhk.co/xizefonuma/dibY5ia/221466803.pdfIn PDF document text
    • https://cdn.sqhk.co/taxuvoguraji/ihf8Chj/19514906017.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/how_can_i_stop_mindless_eating.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/agfific/2545449718.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/gjHhmhc/simple_and_easy_modern_house_minecraft.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/what_is_the_scout_motto.pdfIn PDF document text
    • http://gubuxuk.scienceontheweb.net/3339742108.pdfIn PDF document text
    • http://dsv-trening.ru/taylor_swift_love_story_remix_song_downloaddqynh.pdfIn PDF document text
    • http://zoomita.space/how_to_reply_an_update_emaileaehi.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/homophones_worksheets_for_grade_7o9pm4.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/hijfghY/90764867906.pdfIn PDF document text
    • http://lolkek.xyz/treasurer_s_report_nonprofitlsj0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0b450f-a0d6-4bd6-9a12-9098961e39ce/pesezewinumujibasi.pdfIn PDF document text
    • http://buwijakuwomem.rf.gd/16433823846.pdfIn PDF document text
    • http://larazegabolulaf.epizy.com/82382716138.pdfIn PDF document text
    • http://nolifixumo.rf.gd/95336050133.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/bubijabunele.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/mikuni_cv_carburetor_tuning_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38480c4-d2bf-4d1c-96a6-210f5cbd2811/55662163611.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/real_time_traffic_report_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/cartopy_transform_line.pdfIn PDF document text
    • http://nedafab.rf.gd/bahubali_song_video_3gp.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_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 4992 bytes
SHA-256: 77e444655747ab01aba79d43417e402e415e6de74328fd92214ebebb6ab964ee
font_01_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 11548 bytes
SHA-256: 4b4e930131405e65a087e131ab7ec6a628a00192732e3c0f79175db6c50ec75d

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