Malicious PDF — malware analysis report

Static analysis result for SHA-256 65902c2da47656bf…

MALICIOUS

PDF

69.5 KB Created: 2021-02-22 07:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8091ce06ee2482985dd748f3754d9f94 SHA-1: 2a071695e3f308dc899eca4bdc5f24fa25da7d28 SHA-256: 65902c2da47656bfefc7708d10c694da8a745304a04b6513a1cbb24a33c5cd62
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and is identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users to other sites. The ML classifier strongly indicates maliciousness, and the document body, though heavily obfuscated, appears to be a lure for a 'Pachislo slot machine repair manual'. The presence of multiple external URIs and the link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/123?utm_term=pachislo+slot+machine+repair+manual PDF link annotation
    • http://pubgucbayim.com/counter_strike_1._6_free_for_macbook52mcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497081/normal_6012db6a4e7d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503033/normal_6002c9f0c3155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5fe6ebf0d2dee.pdfIn PDF document text
    • https://defosojuregoko.weebly.com/uploads/1/3/1/3/131383900/zuvof.pdfIn PDF document text
    • http://good-production20.site/time_berlin_camera_watch_manualkh3wu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413966/normal_5ffc7f28827a9.pdfIn PDF document text
    • http://accueilcmb.com/comparative_politics_samuels6g8vk.pdfIn PDF document text
    • http://tumbaa.space/best_lightsaber_companysm20d.pdfIn PDF document text
    • http://groshyk.site/garmin_homeport_downloadm02vo.pdfIn PDF document text
    • http://crawlmqyu.space/lorejuzasujositufusodupasw9.pdfIn PDF document text
    • http://load-bcp.com/812837660330csth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_602c4bd708762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://movufitajameme.rf.gd/how_to_know_when_airsoft_battery_is_charged.pdfIn PDF document text
    • http://figapow.epizy.com/chemistry_matter_and_change_online_textbook_answers.pdfIn PDF document text
    • http://bisiziwaros.epizy.com/wow_classic_horde_leveling_guide_1-_60.pdfIn PDF document text
    • http://movuveso.rf.gd/best_rose_flower_images.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_off0000d3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 5176 bytes
SHA-256: e4abe5f5a4214235b8f51127d45e25f06ee48825c869d98f220608954dc10479
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 10544 bytes
SHA-256: f19b61ec87f80a3d6a659b6f5d9f401a00d88c8753b78e0bbcf96e24c8916546

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