Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e492aa95a80566…

MALICIOUS

PDF

87.1 KB Created: 2021-06-05 18:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7ded0c559f9b595b51a6d885aaa27fc7 SHA-1: c86f2b098ec6f8dd391bce9627c3a6118abba1ff SHA-256: 94e492aa95a8056659026db2fc22ab993db22ae09e90edbd9c2fef6ca29c9aed
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The presence of an external URI points to an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/123?utm_term=new+fha+cash+out+refinance+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424953/normal_604d1ef5774b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486521/normal_5fca7a55c95f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144557709/treat_your_own_neck_robin_mckenzie_download.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/39714652017.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144413934/solving_linear_systems_of_equations_addition_elimination_method_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e9fd9e-0eb9-453b-bace-cd6d4b1ce2b9/why_cant_i_get_hulu_to_play_on_my_computer.pdfIn PDF document text
    • http://jujupaw.pbworks.com/f/22924726775.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144483576/soho_single_turbo_kit_350z.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/74435735363.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144422439/pimawovunipiwuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999c18b1-227b-4daa-a2c9-f8e491df4533/davinci_kalani_4-in-1_convertible_crib_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45c875d-0737-4364-b857-c63a5edbd0ea/tukekodaji.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144432543/27208607712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b4f4dd-db1e-4d4c-8e52-8453ef44d408/sadanutalopotunejufulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1502af59-3b93-4485-afb0-4c121532a3a5/jajabigapebinojixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611f8ab0-0c13-4252-a345-5f35ab30c723/complete_jewish_bible_david_h_stern.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/crasher_origin_mod_apk_terbaru.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144413280/panawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae00bceb-b7b7-4d6a-a033-660473d3057d/how_to_program_overhead_door_model_455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c210d4-d824-41ee-8827-4527ad6e2a68/pre_marriage_questionnaire_for_couples.pdfIn PDF document text
    • http://supijexed.pbworks.com/f/jibulifukoloja.pdfIn PDF document text
    • http://ronefete.pbworks.com/f/farmington_nh_police_log_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 5224 bytes
SHA-256: 6547b1aadb0f700fe365668b53f59a61b6782efec9999968b0d1e1b9e33182ad
font_01_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 11164 bytes
SHA-256: 13fdecbf8f6769693d9aeac2b309ac536b40ad86ce15de6752833472ee30a660
font_02_sfnt_off000140e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176