Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ae86ed99ccf7c9…

MALICIOUS

PDF

81.5 KB Created: 2021-03-25 22:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dbc8e12d5b0c83f1eef1a1e351b0cdb9 SHA-1: 955b96ae398017f61f5c33fc0d7c00d5b3878470 SHA-256: a3ae86ed99ccf7c9ec43f1133768e6ffaf91bfa0bbfeca2140394a264c7d079f
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 0.9992

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://fokemale.ru/123?utm_term=creative+writing+examples+gcse+pdf PDF link annotation
    • http://mefizilexofe.66ghz.com/akai_mpc_5000_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/efkhe72/lurenebikiv.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/cs_deals_bot9c0ez.pdfIn PDF document text
    • http://shortsomfj.space/best_3ds_emulator_for_android_apkt4evu.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/roblox_free_robux_generator_no_human_verification_2019gtrbw.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/AgKJfii/dopuruzifunifob.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/ajdA9hd/london_free_press_online_archives.pdfIn PDF document text
    • http://fixmarker.fun/traffic_crash_purchasing_system4r5p6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cd5bd0-0270-4c84-bd96-b84cf7854cb6/living_cleansing_balm_tm.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/kiredoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71382bea-dc48-4eb6-8bc7-9fbe560fef7c/what_does_it_mean_to_have_peace_with_yourself.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/21500961914.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_f16492d0b8a44bb082ae64656fa2a8b7.pdf?index=trueIn PDF document text
    • http://kedumuwimafam.rf.gd/54373595421.pdfIn PDF document text
    • http://gifibulilak.epizy.com/aix_les_bains_maroc_indpendance.pdfIn PDF document text
    • http://xivobipitu.epizy.com/curso_de_violo_intermediario.pdfIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_e2cc9f9f40304582b36850e83a79b344.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/nidutuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad25076-7dce-4497-92eb-a083ef7d3f4c/how_to_pair_jvc_wireless_headphones.pdfIn PDF document text
    • http://muwided.rf.gd/newspaper_report_example_grade_6.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_93c6826a9d634ad1b9a1790a62f29727.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/9394696100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2689804f-9343-42eb-b8e3-5c18e810e93d/gizodikoxagizipepe.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_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 5600 bytes
SHA-256: 65bb41cca22b196d2e31d41322555d99d32ed7047d533fd5ad81a055050ae886
font_01_sfnt_off000114a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 10360 bytes
SHA-256: f7ab4ac513126bf0f02a0c733269b59cd50c174926a5f31d16891b570f9dc2f3

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