Malicious PDF — malware analysis report

Static analysis result for SHA-256 968683c8b12d84e2…

MALICIOUS

PDF

73.4 KB Created: 2021-02-11 08:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2114d3bc8295f7075aff6d4d7d309d8a SHA-1: 0c51e545bb143405f86dee43db174066556eb1ee SHA-256: 968683c8b12d84e2a06dcf4fa368c43ff0424896676cf87896536a220a392d98
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to attract users through search engines. While no scripts were explicitly extracted, the presence of external URIs and the ML classification strongly suggest malicious intent, likely to redirect users to malicious content.

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://seumenha.ru/aws?utm_term=valkyrie+anatomia+apkpure PDF link annotation
    • http://vivofuma.66ghz.com/21777765146.pdfIn PDF document text
    • https://cdn.sqhk.co/fazologim/ijjgiii/multiplayer_snakes_and_ladders_game_a_java_project.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/a4ifpjc/mad_bullets_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/Oghihii/zoxejusizapikafuto.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/TSEjbgd/download_superbike_racer_2019_mod_apk.pdfIn PDF document text
    • http://pushbiz.fun/official_union_grievance_formwoait.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5fc7e24657e98.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/apache_software_free_for_windows_10.pdfIn PDF document text
    • http://mxbur.fun/anime_studio_story_1._0._6_apk_modkwijs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_6011ddbc89420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495994/normal_5fd1f926e9f50.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/haLgjUm/vocabulary_workshop_level_g_unit_1.pdfIn PDF document text
    • http://connexion-amelii.xyz/pozubetagosirebadatisuv1poql.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451545/normal_5fededd7c423e.pdfIn PDF document text
    • http://wixiziz.iblogger.org/9118883936.pdfIn PDF document text
    • http://inmyshtangen.xyz/29272951870r8a2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepevalir.rf.gd/job_interview_preparation.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE76 3128 bytes
SHA-256: 0f6a9b2a5332f41250960fb990b346858e6aecc0b4ca60d154e9a5a900377a85
font_01_sfnt_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 4916 bytes
SHA-256: 2902dfa7ffe9040ed8dc227c03a6a030526c03dc51f594992da6a96f4651a854
font_02_sfnt_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 12264 bytes
SHA-256: 404486fada96f4fae2642fb3b70dc2e1ccd3e9073272dea1bbfbedab18317f14
font_03_sfnt_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 16128 bytes
SHA-256: 76e4bb2a876f2df071203376bb198c2fb9bc2e27c2e6c329b49c728a92207d52

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