Malicious PDF — malware analysis report

Static analysis result for SHA-256 7987b6e1e14af785…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 23:29:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 81c9b41a31ab0fd7b09fee9a6a05d6c9 SHA-1: 798e6d4a507e243363edc9f0a20012ef14cc194f SHA-256: 7987b6e1e14af7854c8bf400827140e905889d22f2333e5ee90c02e95e9f4b8f
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains an external URI pointing to a suspicious domain, and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to trick users into visiting a harmful site.

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://nipisod.ru/award?keyword=basic+workout+program+pdf PDF link annotation
    • https://cdn.sqhk.co/ginijetemepa/gqojchf/87398456645.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/hcbZjcP/major_mayhem_2_mod_apk_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/ehi3GCl/application_giant_ride_control_app_bedienungsanleitung_deutsch.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/sefibafegun.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/weluvadiloju.pdfIn PDF document text
    • http://bizowokare.getenjoyment.net/fefobitedizavuxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450250/normal_5fdf9159bf7fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_601889731d851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_603ebcd6a2b18.pdfIn PDF document text
    • http://ladebizelase.scienceontheweb.net/xujepuvepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_5fd646ee400d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4bbf79d8-97e4-42de-9a75-948158c354f0.filesusr.com/ugd/52f5d3_ff8eee69904643279b3a18ed7c46cb96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/cribbage_board_template_free.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/how_the_grinch_stole_christmas_nbc_2020_cast.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_d42262759aa04cc792103415e15f5e07.pdf?index=trueIn PDF document text
    • http://baxewape.myartsonline.com/cephalgia_kronik.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/first_written_warning_letter_template_australia.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_2008e59e984446e79b4fed935f407acf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/balloon_decoration_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/wopixifafetofilevuxisi.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_7ebf8741fef642c4a2b808711e29fbdc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 5648 bytes
SHA-256: c3d7d5f98f246aebd302fe550152b23258c4a80e638e0f97f59dfb5dcad597e5
font_01_sfnt_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 10572 bytes
SHA-256: 77866dc3777b10109109f79a93e8ddd8f6710c66776ef9e39e3d8136f6b82592

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