Malicious PDF — malware analysis report

Static analysis result for SHA-256 913d464109062e74…

MALICIOUS

PDF

89.8 KB Created: 2021-03-29 15:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b6d50c50e4fd845576e708985028a98c SHA-1: 5b7877309cfb4c6778f7dfa00dc23ab590a3eafd SHA-256: 913d464109062e747762fbf07e76dea62102930f34e5ea5501cf17e74f38e32e
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 0.9998

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://gimoguvi.ru/strik?utm_term=ubuntu+linux+command+line+cheat+sheet PDF link annotation
    • https://legobunisazej.weebly.com/uploads/1/3/4/5/134501617/wesorali-nusetolujefa-guzikezipeviwip.pdfIn PDF document text
    • https://zoletewiv.weebly.com/uploads/1/3/2/6/132695336/vegofafa.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/english_for_business_communication_teacher_s_book_free_download.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/etica_para_amador_libro_resumen_por_capitulos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_5fe6a7b830b00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_60120bffcb0b6.pdfIn PDF document text
    • http://domen3.club/5447817323855y0p.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/eghhhgg/13459594437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414860/normal_6037bb8549740.pdfIn PDF document text
    • https://moxuranib.weebly.com/uploads/1/3/4/3/134345095/pipamoxafex-borugopimarom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451369/normal_5ff795173b033.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/ketogenesis_and_ketolysis.pdfIn PDF document text
    • https://cdn.sqhk.co/nisavivurefu/haFjcig/84044121435.pdfIn PDF document text
    • https://xunitumewotoril.weebly.com/uploads/1/3/4/6/134612341/8146112.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/radugojetife.pdfIn PDF document text
    • http://rubeatyshop.xyz/accident_reports_youngstown_ohiovllbg.pdfIn PDF document text
    • http://keto-menu.online/how_do_i_reset_my_yamasa_slot_machinevfnjo.pdfIn PDF document text
    • http://studyweb.site/buxivigusewuewduz.pdfIn PDF document text
    • https://cheatography.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kexomun.myartsonline.com/ethical_considerations_when_conducting_research.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_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 5280 bytes
SHA-256: 3c3e15d297e67df68982587d4dcf64182baab20f696db839ce590d4d5f8140e0
font_01_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 12780 bytes
SHA-256: 448d889924fcbe694385c37c1ae1f38c18501623b35084cb56c613d84cb22a26

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