Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1fdd337463793f…

MALICIOUS

PDF

75.2 KB Created: 2021-04-17 19:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d33955bcd30776e7a2f8419139cd088b SHA-1: b7f2b7758cf426dd3c6c3cc1a105db732d9b080c SHA-256: bc1fdd337463793f23831ffb3950bd6f3400a2540bedd189f50e127b95a335a4
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 0.9996

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://botokaw.ru/strik?utm_term=how+to+calculate+percentile+rank+in+excel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498330/normal_5fe4288228234.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/bazakodajesalojixiside.pdfIn PDF document text
    • http://nominasacra.ru/infection_board_game_rules40w7h.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/veeder_root_serial_interface_manual_tls-350.pdfIn PDF document text
    • http://wujasonuvilo.mywebcommunity.org/catfish_blues_tab.pdfIn PDF document text
    • http://sis-paypal.com/8_ball_pool_game_free_coins_linkjsk80.pdfIn PDF document text
    • http://letgtma.bid/xotamevifixukeguwitastvfkd.pdfIn PDF document text
    • http://timelessdecorum.com/verafezi9tqe.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/fusionner_fichiers_mac.pdfIn PDF document text
    • http://uk-delfin.ru/32303240820camde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460063/normal_606b86f797738.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/70905774192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5fd88e87701fe.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/1101ca1f-8cd9-4202-b361-fd2183b83d59/fuxologupumipinikozowub.pdfIn PDF document text
    • http://jowokepo.atwebpages.com/budaya_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02ca931-bf66-4fc9-9256-21d39fdbebe8/zoxobasafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b976e95-9996-40dd-a1e8-21386e1baf87/best_chess_books_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c7f977-9df5-4d81-8b96-baff1cc30e97/the_game_movie_explanation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb3e879d-da80-43f2-88cd-6e7bde245b3c/19596107639.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/44838867258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2a7c01-d3b0-4b4e-b522-ca19a19ec1f0/fawiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95595ef0-bcfc-4f7a-be20-71dd03b7ca7c/tenafewoletudin.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_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 4936 bytes
SHA-256: 94e6df539369890533e90363fa5640c8fb70104713089dc65ab78dac6d7f06b0
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 11320 bytes
SHA-256: e9517fd7a92e98123475330e85224273fd814ecfeec113eeebb618f7807e950d

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