Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0893a5f1afbee5…

MALICIOUS

PDF

82.3 KB Created: 2021-04-19 06:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3b4a4028757f34680f6196fb9faac014 SHA-1: 9a3205d97e302fb2163377ba76d0264fa908f3f5 SHA-256: 6a0893a5f1afbee5ae44a74744d71d0427a16bdd4d9ae83c208beadcf803a8d9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly benign ones. The primary malicious URL identified is https://seumenha.ru/strik?utm_term=agendas+alternatives+and+public+policies+pdf+download, which likely serves as a redirector to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://seumenha.ru/strik?utm_term=agendas+alternatives+and+public+policies+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454679/normal_606d16dedb18d.pdfIn PDF document text
    • http://misiliv.66ghz.com/14638492631.pdfIn PDF document text
    • http://xilevidesidol.22web.org/airline_manager_2_cheats_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_5fd12a00b0c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_6041a90d8911c.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/23859473507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_600ba3d4372a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384821/normal_5ff7dac772451.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
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_c36bfd961bd54c3e94b9c46b8cbee563.pdf?index=trueIn PDF document text
    • http://werexixudi.rf.gd/cisco_3500_series_switch_datasheet.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_cd9939af683e485d8328221f2603e24f.pdf?index=trueIn PDF document text
    • http://mewarur.rf.gd/solovajodugiwifaturesovi.pdfIn PDF document text
    • http://gatinilub.epizy.com/ivory_sheets_a4.pdfIn PDF document text
    • http://jemukiguwuw.myartsonline.com/canon_eos_rebel_t5i_manual_espaol.pdfIn PDF document text
    • http://mifijikamipupu.epizy.com/32984208672.pdfIn PDF document text
    • http://wugepigen.epizy.com/apc_back-ups_rs_1500va_battery_replacement.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_434083b9cdcc4068af74f9c437cf28b2.pdf?index=trueIn PDF document text
    • http://bogizun.epizy.com/44808227937.pdfIn PDF document text
    • http://gukupexokopiwug.epizy.com/english_synonyms_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63d7d72-ce0c-4d07-a11e-a6767f014888/36982938779.pdfIn PDF document text
    • http://xitugukunorijiw.rf.gd/51153536212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf317257-b5f3-4e74-83ce-3bdfc1f7eeee/36376312027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6856169-d28b-4c76-ad93-2a3acda5c805/identifying_figurative_language_worksheet_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575fb450-be50-47ec-baf5-922491856eed/19812654645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b12e296-6e50-4e23-b93e-64324fa7827b/zorba_the_greek_book_review.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/journey_to_the_west_2013_hindi_dubbed_full_movie_download.pdfIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_ab441afa5fe149f5ab514b695a5d3598.pdf?index=trueIn 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_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 5484 bytes
SHA-256: d8d13f4f9786049124e2d72705ea7200218fd7091db80759c330c6394f3542e4
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10820 bytes
SHA-256: 0757d60e6ae181a79504672308472a1a56c1593891f6c53bebfc39ee7559d296
font_02_sfnt_off00012d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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