Malicious PDF — malware analysis report

Static analysis result for SHA-256 4324d380fcc97fe7…

MALICIOUS

PDF

73.7 KB Created: 2021-03-22 04:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6a5541779d8dfc93d2704507610a977e SHA-1: 123f794316e4558845216439c7bf69a7d208a25a SHA-256: 4324d380fcc97fe7d67bdd0d2f73d91beeec2721eb72a69d1ef3fc1594ad70c7
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 0.9998

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://golowaki.ru/award?keyword=flood+risk+assessment+report+pdf PDF link annotation
    • https://cdn.sqhk.co/rukugewul/hieOVgf/mekorama_level_25.pdfIn PDF document text
    • http://nomudepalak.medianewsonline.com/wegmans_catering_menu_2020.pdfIn PDF document text
    • http://zotoxilob.getenjoyment.net/star_wars_ahsoka_book_barnes_and_noble.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/69885233693.pdfIn PDF document text
    • http://lnstagramverifycentre.com/alex_rider_operacin_stormbreaker_online_espaolybd1c.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/igexyG2/45707239738.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/fjiZghI/gonejezazigamajegumeti.pdfIn PDF document text
    • http://dekoriribazovax.mywebcommunity.org/bigetagetamoruza.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/CNgefs2/33365703637.pdfIn PDF document text
    • http://kyhni.site/test_automation_feasibility_analysis_reportd90h6.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/igjjpgj/tatafesuzunig.pdfIn PDF document text
    • http://italiahot.fun/whirlpool_dishwasher_full_user_guide_filtration_systemmyf29.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/Ugdigib/say_hi_in_chinese.pdfIn PDF document text
    • https://cdn.sqhk.co/tebolugex/hsheifa/old_snake_xenzia_game_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/aprender_japones_livro.pdfIn PDF document text
    • http://negumigimewote.onlinewebshop.net/mekup.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_9cd9b68cc562478e8d3e0fbf8ae9acca.pdf?index=trueIn PDF document text
    • http://gixarewujedel.atwebpages.com/biosecurity_of_plants.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_3f8c1bf976c64bd19b966c77d4692304.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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 5204 bytes
SHA-256: 32c44fa96ab69d918d194538e99600153dd23e651f33cd1f32370a5068fdb480
font_01_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 10792 bytes
SHA-256: e1629a3d983aa06b7a2f1733dc8a3128af29491999dbd60c8887eb647ce18d14

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