Malicious PDF — malware analysis report

Static analysis result for SHA-256 58248581dcaaeb20…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 15:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4579939b84a4f83992cb5eaafdceaca3 SHA-1: 368da43107cb8dfff16c381b21beed7a939e2612 SHA-256: 58248581dcaaeb20e1728374c149c5f05a57506ad960cd5f3f166ca3b7105dd0
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=university+degree+certificate+template PDF link annotation
    • http://favodokoleti.mypressonline.com/lafudubadefofubisoni.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/83969600165.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/washington_dc_metro_map_download.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/nowevepubugawubol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480412/normal_600858e355889.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/guverixebetozisebev.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/dia4hiS/lidudokeruvome.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/beaufort_wind_force_scale.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/icgiwkR/mega_3_numbers_payout.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/jeif6gf/msx_game_emulator_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_5fd389b988220.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/sojatamemapupaderarap.pdfIn PDF document text
    • http://xabudumame.mypressonline.com/car_body_parts_diagram.pdfIn PDF document text
    • http://linefofaxugedu.mywebcommunity.org/jewokozaso.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/8abc89fd-f7f9-4014-9df6-e81e572d5620/how_to_improve_your_sat_math_score.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/irish_to_english_dictionary.pdfIn PDF document text
    • http://jubogaju.atwebpages.com/why_is_my_fios_router_blinking_blue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1708d3da-cd0b-4894-a5d9-f80630c7e3bb/23812306303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae07f702-de35-4fdd-9c09-a75a99ad7b67/how_to_talk_to_a_real_person_at_fedex.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_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 5628 bytes
SHA-256: 3a94cd2d9f5701e026724c08d7c0c542e7c0b5fbbf394daf000199fd3bb6fbcf
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 10280 bytes
SHA-256: c86b55f4cadbc1d207717838872b583daf871fa2df17294f4b3b6d587fff43c8

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