Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3913d8b5d45aef7…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 18:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3f60e04679998a167a1082fef19e313e SHA-1: 413826dc3de4ddaad180079ebe11dedf3551d571 SHA-256: b3913d8b5d45aef7319c569ea58020e7a2d837a089fae1b611792669717475a2
126 Risk Score

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-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://vilenefex.ru/wix?keyword=kwikset+910+manual PDF link annotation
    • https://cdn.sqhk.co/koxuvusu/jeD1Uia/sidutesutagujosuvofujiref.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/gjkcjfx/wallpaper_engine_msi_dragon_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/dixobiwi/3ygjLBJ/bubble_shooter_3d_game_free_download.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/cfa24c00cf.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/what_to_do_with_old_verizon_lg_flip_phone.pdfIn PDF document text
    • https://kifakofaw.weebly.com/uploads/1/3/4/0/134016777/gipilatafivon-kuvezoxuluwo.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/energy_drinks_facts.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/dO9QVpt/malagekiseb.pdfIn PDF document text
    • http://lovupijuti.getenjoyment.net/how_to_contact_planet_fitness_corporate.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/ebsgfji/ates_ve_su_3_kitap_oku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_bd7b9b3130794c5e8e61ef4d298f6148.pdf?index=trueIn PDF document text
    • http://povasapodojika.epizy.com/gems_of_war_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/sample_answers_for_interview_questions_handling_conflict.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/77130863272.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/doubling_and_halving_sheets_year_1.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/international_business_articles_2019.pdfIn PDF document text
    • http://tuzufuwav.rf.gd/90639579310.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/binding_mode_xamarin_forms.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_ae08df06f6264466bb44a2e2a6f3c9d2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 5208 bytes
SHA-256: c77a59cf9ce8307a05d1170346e4f2b385594abd286866945fe34c58fe858aeb
font_01_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 2720 bytes
SHA-256: 990d8ad98d66c31862a2709cddd806a5b033e8db86a2e80534a51461a5759458
font_02_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 11192 bytes
SHA-256: 3b55cd799c59977d0b02b9a75536a593b6d965f3538dde47f07a50853dc0ef76

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