Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90ee272452fbeeb…

MALICIOUS

PDF

77.8 KB Created: 2021-04-03 21:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24307a59bd3c90f5966375e8a1fc958a SHA-1: 7507f90a1a976b4df5475c4374ee2d11ba540947 SHA-256: b90ee272452fbeeb6998b8be8cd163e057a31a13ea77e86d4bfa89bdff976207
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://yafferge.ru/award?keyword=damodaran+investment+valuation+pdf+download'. This, combined with ML classification and ClamAV detection, strongly suggests a phishing attempt designed to trick users into downloading further malware or visiting malicious sites. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/award?keyword=damodaran+investment+valuation+pdf+download
    • https://cdn.sqhk.co/takulowizi/enoiegh/loliba.pdf
    • https://cdn.sqhk.co/tubawonidas/jglGsjf/war_and_magic_android_hack.pdf
    • http://rasudilikid.mywebcommunity.org/why_do_natives_not_have_to_pay_tax.pdf
    • https://cdn-cms.f-static.net/uploads/4464700/normal_60683039eee70.pdf
    • http://gaximivotekole.mypressonline.com/vatawitazaseluremaru.pdf
    • https://cdn-cms.f-static.net/uploads/4388416/normal_603da92bad301.pdf
    • https://static.s123-cdn-static.com/uploads/4372076/normal_5ffa322320306.pdf
    • http://zijixiteluwek.scienceontheweb.net/balance_sheet_analysis_and_interpretation.pdf
    • http://reduslimitaly-official.website/car_bill_of_sale_form_texas0sv2e.pdf
    • https://cdn-cms.f-static.net/uploads/4386622/normal_605f64beec06e.pdf
    • https://cdn-cms.f-static.net/uploads/4443326/normal_602acf0f39be2.pdf
    • https://cdn-cms.f-static.net/uploads/4368494/normal_601150d437a80.pdf
    • https://static.s123-cdn-static.com/uploads/4403141/normal_6007c598372ab.pdf
    • https://cdn.sqhk.co/wazewiput/ggiTxhf/dunebuzo.pdf
    • https://cdn-cms.f-static.net/uploads/4385020/normal_6041329ac23f4.pdf
    • https://cdn.sqhk.co/wexunaveb/gjjjuge/free_funny_ringtone_apps_for_iphone.pdf
    • http://health-top.ru/pgx2a.pdf
    • https://cdn.sqhk.co/vafegijateno/a3ohad8/juegos_de_drones_on_linea_cocina.pdf
    • https://cdn-cms.f-static.net/uploads/4450347/normal_605d6ea3de67f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1ac0dfd9-e2c2-4c38-b24d-8a730ee95dee/rifiwe.pdf
    • https://uploads.strikinglycdn.com/files/539c7707-c4d3-4f60-afdd-5781a7d4e808/8246840400.pdf
    • https://uploads.strikinglycdn.com/files/df109e6d-53b1-4759-a0fb-90f5d80e1595/clover_water_cooler_instructions.pdf
    • https://uploads.strikinglycdn.com/files/2825637f-a7c4-4e5f-a5e5-b0e817f83b13/relion_prime_battery_replacement.pdf
    • http://rotufixijisadi.onlinewebshop.net/port_timing_diagram_of_2_stroke_petrol_engine.pdf
    • http://gepivefukusi.atwebpages.com/79750333815.pdf
    • https://uploads.strikinglycdn.com/files/50407833-3493-4c3e-a601-b846701dbe6d/how_much_is_adobe_premiere_pro_monthly.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ee.bin
8551e564d5297490f86e2844eb6a0ba0d9ed5f54688b51e4e1b032d21a67e6ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 5340 bytes
font_01_sfnt_off00010519.bin
4ea1debe73ee9ba7c7a3d48f477e403202c494d90636fc231c24f9ae76eeeb8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 10968 bytes

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