Malicious PDF — malware analysis report

Static analysis result for SHA-256 8800be9ab50f9ec6…

MALICIOUS

PDF

79.8 KB Created: 2021-03-28 20:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bd1699d1ec6a2736c7c0658c75922443 SHA-1: 590aed97598a976ef7a46185bbeda36e48d09b69 SHA-256: 8800be9ab50f9ec628a2118da248803dc1d7d9b8a05d9f6ef47528bfbdcdc972
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection or content delivery.

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://nipisod.ru/123?utm_term=math+worksheets+grade+3+fractions PDF link annotation
    • https://cdn.sqhk.co/jigekuragige/UjbleCA/93386051335.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/hsPh1ia/pixel_gun_3d_online_pc_no_download.pdfIn PDF document text
    • http://ketrovk.xyz/how_to_make_a_paper_booke7d49.pdfIn PDF document text
    • http://espacecmb.xyz/what_sign_the_moon_in_today4rfbl.pdfIn PDF document text
    • http://huaweistoreukr.xyz/a_druids_handbook_to_the_spiritual_power_of_plantsaw8ds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_60536276e95a2.pdfIn PDF document text
    • https://cdn.sqhk.co/zozevuxe/iajjOjj/14924680445.pdfIn PDF document text
    • http://laura-egorova.ru/andropen_office_apk_prorjaw9.pdfIn PDF document text
    • http://gagafelame.22web.org/whirlpool_quiet_partner_iv_parts_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/marebilan/cSjji0t/28019310387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_60559e0c89e48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vokuloramemi.epizy.com/what_are_the_rules_of_beer_pong.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33cd2294-af78-45bf-b8c4-f59607928453/19932225708.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/60761890827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27b0a85-df0e-40bc-bce9-78cb4bd84cff/wd_my_cloud_ex2_ultra_camera_backup.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/91752700824.pdfIn PDF document text
    • http://fepoxojosatomu.epizy.com/badamamotemonupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a02fb3a-614d-49ad-bdb3-f8cc90e42839/surirupiminojuv.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 5576 bytes
SHA-256: c40bc106ff40b4be65ba744e18d82482a6e6b9274b37bbac7606f15e291f12f8
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 11120 bytes
SHA-256: b202aeaa5a27af22a8e2747aaa47db144d10cbc7b70031e5717254e88e18d7cc
font_02_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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