Malicious PDF — malware analysis report

Static analysis result for SHA-256 20821f5631e56fdf…

MALICIOUS

PDF

124.9 KB Created: 2021-05-04 06:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8f47688074bfda05793d930c55e510f5 SHA-1: 928054b2db3d54e37c0dd9af8953d2fc20e8b173 SHA-256: 20821f5631e56fdf3cd062df32fa7cc9d54a7467d5dbdc8a0c8b11a381f220bf
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 0.9998

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://mezovuduw.ru/strik?utm_term=smart+board+for+school+price+in+pakistan PDF link annotation
    • https://cdn.sqhk.co/milimewaj/gehghic/atom_platformio-_ide-_terminal_not_installing.pdfIn PDF document text
    • http://pirunumilusarib.sportsontheweb.net/blender_robot_modeling_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/cghltgc/crowden_car_park_postcode.pdfIn PDF document text
    • http://mokuduvejevuz.scienceontheweb.net/soal_aritmatika_sosial_smp_kelas_7.pdfIn PDF document text
    • http://zufutefej.22web.org/kenujemo.pdfIn PDF document text
    • http://sabazat.22web.org/how_to_break_open_a_sentry_safe_box.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/miePsDf/the_shadow_sun.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/hhbjdUc/hyperion_launcher_pro_apk_v48.pdfIn PDF document text
    • http://sezutupinamizan.22web.org/29780159062.pdfIn PDF document text
    • https://cdn.sqhk.co/nadoranur/6hbCjdP/63081774220.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://74f55dc1-c9a5-4be3-8cb6-5a41d2e6c5ca.filesusr.com/ugd/bacb18_b8f080681e58419a8213105be17a4137.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_4b79261921cd490487556b8858d8686a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d267efdc-6cab-491c-8c8a-d9f37f4377f8/bovuwuzo.pdfIn PDF document text
    • http://dopovis.myartsonline.com/does_flight_simulator_x_steam_edition_work_on_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff97b5b2-51e5-46e3-a8ca-95ccfa916791/dell_xps_8300_network_adapter_driver_download.pdfIn PDF document text
    • http://visegob.epizy.com/66910003308.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/english_worksheets_for_kindergarten.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_b84623321cad427095193e0bb2d0ca7b.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_ef47eb6a410c4a6a96ed5f2f82ebd651.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001abd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABD4 5704 bytes
SHA-256: 43af8b882082b882ab82fc69687dd68e6cfcc88edc6b7d09329abe3b4998eef6
font_01_sfnt_off0001bf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF07 11288 bytes
SHA-256: 8eeb3dbf08898c9aa3d0d5bd3e3f4ba8805ac5cc397bbe4f6a73f3c6928139e3

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