Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2a27a59da0d146…

MALICIOUS

PDF

72.3 KB Created: 2021-04-02 22:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: efe204a7adb6d015e92be311312a2995 SHA-1: d8215644f0feb7b351dff7aad82652a956e48467 SHA-256: 0b2a27a59da0d14658f7b1621d45b7699c6f925bab72252499ff552bdcab06cc
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=daily+grammar+practice+11th+grade+answer+key PDF link annotation
    • https://cdn.sqhk.co/kixobaza/ijcjggf/69593229621.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/ihD55je/vapijaperanerula.pdfIn PDF document text
    • http://olipaka.xyz/72425903628l6jkk.pdfIn PDF document text
    • http://phulop.store/dslrbooth_app_androidk46e2.pdfIn PDF document text
    • http://secureappeal.com/20623124755iwtme.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/tigifemazodokuvenugitewot.pdfIn PDF document text
    • http://circulshtangcalip.website/how_to_find_magnitude_of_normal_force_on_an_inclinentrpc.pdfIn PDF document text
    • https://cdn.sqhk.co/doginifa/5hqsjfy/ice_cream._places_open_now.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/gSie2ib/archipelago_dc_reservations.pdfIn PDF document text
    • https://cdn.sqhk.co/lewenowaxer/jfRhhjh/dead_ahead_zombie_warfare_wiki.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/diary_of_a_wimpy_kid_show_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/zutomina/diizHO0/lomusivosovupoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/majukedow/csijejb/warefagasigolerenu.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/jiaBjad/fodorefifeboxume.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/idsicqx/vidabowigupu.pdfIn PDF document text
    • https://cdn.sqhk.co/sokidamanel/hgghk0Q/65384325119.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/hiVhgXK/prince_running_woking.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/logivafaxidimumobavokunar.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/bowijalorilemufelotigabek.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/qhhgffW/ios_keyboard_control_keys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a413096-4115-453c-84a6-e19f3d0a1e7a.filesusr.com/ugd/4a2d03_46fc3cb6f8b74cfbb7e2cf321fa1da5f.pdf?index=trueIn PDF document text
    • http://wadoromutisagar.myartsonline.com/58168550453.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_167d14cb268e46bc842133d507c76fde.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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 5796 bytes
SHA-256: e0a5835fb5eb79eb3622df4ef7d8f1914d9482b58a1d2ab9f4b27f89385c6703
font_01_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 11344 bytes
SHA-256: a9210780bd643baf14e793d74835ce3c3ab25b2cab43f5b14889d07825827992

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