Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf7270e5c3a73cf…

MALICIOUS

PDF

77.0 KB Created: 2021-03-12 19:07:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0cac6daaf39e61c97f8b678843c1954f SHA-1: 169534ce06db250a8456767ddc0a28b8bd0fae4d SHA-256: 4cf7270e5c3a73cf24058ee62b88bf0ff355b11c40875d255d8f28bf304111be
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential phishing lure related to 'amazon redshift tutorial pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://ponafet.ru/award?keyword=amazon+redshift+tutorial+pdf PDF link annotation
    • http://nufurimuler.iblogger.org/can_you_negotiate_apartment_rent_nyc.pdfIn PDF document text
    • http://logekolumo.22web.org/5322694886.pdfIn PDF document text
    • http://lirerigoteses.22web.org/netflix_business_model_canvas.pdfIn PDF document text
    • https://cdn.sqhk.co/bidufewo/Lifhahy/dinosaur_rampage_dragon.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/pKWsjcs/mario_odyssey_amiibo_3_pack_best_buy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_bef2e185f048494c993b3337ffe76804.pdf?index=trueIn PDF document text
    • http://kikivalisexe.epizy.com/happy_birthday_song_piano_sheet_hard.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_61805fa5c0c940468d2d7a9b7d50eca3.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_ac29ca50c27c4bb181a30360f67c285f.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_66084a01b04f4eeca98f8d801c12935e.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_4184970678f44fba9c60a7495c0028a1.pdf?index=trueIn PDF document text
    • http://zepedijuva.epizy.com/11706180226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/408722cf-9e0b-4753-b5b2-d0979ea66e74/how_long_to_read_the_game_of_thrones_books.pdfIn PDF document text
    • http://daraxelasapok.rf.gd/vowidaxirulajubigowir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a3f179-185e-426b-8f93-d8db10292d5c/kopew.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_02d43cf256ee4d86b0e1bb2a2f8f381b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/206adea0-106f-4b7d-b341-dba3a18943dd/que_es_la_educacion_basica_media_y_superior.pdfIn PDF document text
    • http://wepiliga.epizy.com/how_to_get_grants_to_buy_land.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_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 5320 bytes
SHA-256: 985058514547e103a23adc31cafe549402304f9c1242b301d73ebe01c4080c80
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 10800 bytes
SHA-256: c83bf8d90ba169533e79536fd18f111542981f84a1ea130a583a4bfa8ac3932f

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