Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d04397f50315b3…

MALICIOUS

PDF

74.7 KB Created: 2021-03-15 20:17:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c05910777c8946de2aa9586c04da094b SHA-1: db711933ab6f89b24ffa894b3327f64fae4f16e9 SHA-256: c6d04397f50315b3edf68dfce1fa91a44b5c22a9c004bb1b31f66f2a9ffb1dac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, many of which are flagged as disposable or potentially malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=leyes+de+radicales+ejemplos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404976/normal_60304e40cf33c.pdfIn PDF document text
    • http://world-wildshop.com/293789195435lyuu.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/chmghzp/81177575396.pdfIn PDF document text
    • http://am-sound.ru/12107671852918nr.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/hghhhBC/15137432265.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/0ghnhwE/zeus_skull_tattoo_designs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475854/normal_604786a8e5da7.pdfIn PDF document text
    • http://kind-insta.site/zafovirovopoxab1teql.pdfIn PDF document text
    • http://moreprodukti.com/vazolawosogegigaxemofeh5xzh.pdfIn PDF document text
    • https://cdn.sqhk.co/wasefago/ghgZjiG/car_racing_offline_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/gayv2hb/datumemigifilawilasilupas.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/dhbhkii/word_worm_online_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fe64e8a6f4f7.pdfIn PDF document text
    • http://dihtyar.online/snake_bus_io_online6duy5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_603fcdc36bf35.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/3fcb1f3f-fabd-453d-98bd-58a665820551/sudukotazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325fe60c-69c7-42f4-9960-b76131a89fec/bomuzedilagekefepiruweri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90b8227-734c-434e-9293-a1a3d034be83/what_is_the_beast_a_symbol_of_in_lord_of_the_flies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11bc2eaf-ccb6-445c-97c8-2a56144c5191/business_analyst_degree_online_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03699c03-3a0a-4781-be99-447c3dc6ee09/cisco_network_security_fundamentals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bdb6495-4d76-44b1-bde3-96ef806d0cce/79857839646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30543645-c4d9-4238-91fd-ff44a025e0f1/planet_dd_alignment_test.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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 5340 bytes
SHA-256: 64c0c9491bee20ed6c8bf30197e3478906391d142cf2f76df3bdfc7aef58b31a
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 11484 bytes
SHA-256: 2e222fb2597b07e2f514e6124714d1c9a0516cb3967786c1e61c969caa004aee

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