Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bcefedcccb0af9…

MALICIOUS

PDF

148.0 KB Created: 2021-03-15 21:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eb6b9238fa1fc7c70f6929446e957cb6 SHA-1: 50c927528db4cfcfe65102100b4838b70b41f3e8 SHA-256: 55bcefedcccb0af90a0250d68d118ee3ffd7bf12aa61119572bf3acabef130e5
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 0.9996

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://jottigo.ru/123?utm_term=bourbaki+integration+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489740/normal_6037ebfcef740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465133/normal_60304379cac77.pdfIn PDF document text
    • http://redit.fun/how_do_i_change_the_resolution_on_my_dell_monitor59apv.pdfIn PDF document text
    • http://sallles.ru/bloons_tower_defense_6_guideo5k15.pdfIn PDF document text
    • http://passive-income.ru/how_to_connect_bose_acoustimass_5_to_receiverh13oo.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/bhidNvw/kosaziximivuliturinedoj.pdfIn PDF document text
    • https://cdn.sqhk.co/diwelamu/hgjp4gd/17780724240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_6045e7ab82b81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_60436bf0986bc.pdfIn PDF document text
    • https://cdn.sqhk.co/nujoxodove/DZcmgcL/33122088487.pdfIn PDF document text
    • http://copyright-infringement.business/my_name_by_sandra_cisneros_tone42crr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459774/normal_60405d9698063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_6048dc22e3643.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/bPTYMpL/fun_body_hacks_and_facts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepeporiluvoxaj.epizy.com/3859255811.pdfIn PDF document text
    • http://gamemogap.epizy.com/46509392144.pdfIn PDF document text
    • http://xexojonorowo.epizy.com/49368631474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a944906a-cea4-4381-89cf-267fee29af6a/how_to_learn_arduino_programming_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870d92b2-722f-4025-bf42-6054c2bb0d25/wubuw.pdfIn PDF document text
    • http://napizexem.rf.gd/93177653064.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_off0001f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F062 5252 bytes
SHA-256: b5bf833e2e7260529d403ad64e0c8af920d38fe6b6963f18e9e1106f902f8016
font_01_sfnt_off00020255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20255 13100 bytes
SHA-256: d47a2cec2509d9f2a6b0c549fe2d5b153f06d846f0d5664374713682493cf207
font_02_sfnt_off00022c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C0E 16376 bytes
SHA-256: 68acb238b7bc5af7338f68ef20260ca26aed5fcd6db2f5278aab988a868c6168

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