Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc97af0f91140d4…

MALICIOUS

PDF

80.1 KB Created: 2021-04-02 19:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 659c9a9bbbbc304e0c9a0f0b19f7db57 SHA-1: 5558bb81e127c46fdb217827f9753348054fb146 SHA-256: 0fc97af0f91140d4a47562178b8f97a6e9cacc5dea711520d605ed94e2bf3a52
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 0.9994

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://lozipotod.ru/award?keyword=attractive+advertisement+project+pdf PDF link annotation
    • http://thrivewebs.com/can_druid_dual_wieldnnswd.pdfIn PDF document text
    • http://limuzinof.ru/inductrix_fpv_bl_reviewd2d8d.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/lab_diagnosis_of_bleeding_disorders.pdfIn PDF document text
    • http://stassikorskyi.com/el_pollo_loco_sidesrez3y.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/tulsian_accountancy_class_11_solutions.pdfIn PDF document text
    • http://ottics.ru/basketball_stars_mod_apk_unlimited_moneyoci7d.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/buvok.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/olds_maternal_newborn_nursing_9th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_d75f449a115e4b8fbe6a3547f3778a48.pdf?index=trueIn PDF document text
    • http://digimoxesimukus.rf.gd/viwagemamaxot.pdfIn PDF document text
    • https://504b7f7c-d27d-4f2b-a6eb-e8dc7cf660cf.filesusr.com/ugd/6ba015_abbfb364edf24b9baa9bf565e036c4f6.pdf?index=trueIn PDF document text
    • http://vuwejamadadodi.epizy.com/present_tense_and_past_tense_worksheets.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_3394d0507dcb43dbac12feafbf68dff5.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_5eccd67a089a473f9887244140857aa1.pdf?index=trueIn PDF document text
    • http://vozajaw.rf.gd/publisher_cookbook_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d97f015-d996-4978-b1d3-84abc1f7af9e/ashtalakshmi_stotram_lyrics_in_sanskrit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718cf913-f3a2-4778-af74-bcabc42c6998/pirusaj.pdfIn PDF document text
    • http://gexepitirunagu.rf.gd/how_to_write_a_dogs_howl.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_bd20ba4cdfa24a1d9cceededbc8a6d9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/768fbdf0-c530-4ba3-96ac-3840faee5381/trigonometric_equations_cheat_sheet.pdfIn PDF document text
    • http://bumosutu.rf.gd/dexeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6541a653-b59f-4843-b0d6-853ae3ccc14d/futukufobiv.pdfIn PDF document text
    • http://somifisuvukibuk.onlinewebshop.net/architecture_residential_drafting_and_design_12th_edition_free.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_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 5396 bytes
SHA-256: 9f18ad0b92320fed673def169ae7012ee6c3cdbd67f0b88fe74b452b521907aa
font_01_sfnt_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 11560 bytes
SHA-256: b2562729c514160f62b9d2061b11f2831b645c5c522df956bbb01e6af3b8e564

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