Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4c198c259ba6c4…

MALICIOUS

PDF

76.0 KB Created: 2021-03-02 19:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8d25cbfdff79e05c1cab41830e842aba SHA-1: 170354e31c23b1926768e246f61447812bbb15de SHA-256: 3e4c198c259ba6c4ef654a201f6cfbd8e810db02179c8b59e9bf24302f7e185f
126 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=sta-rite+cristal-flo+high+rate+sand+filters PDF link annotation
    • https://cdn.sqhk.co/wojidumezu/gdHUjdt/shooting_the_stickbow.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/hgQhhie/dead_empire_zombie_war_cheat_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/Yie0Fid/zeges.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/Cptsjcf/the_spearman_correlation_is.pdfIn PDF document text
    • http://uchebnoe.website/pringles_mystery_flavour_clues_3_answersyxg3q.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/o4ibDji/online_racing_games_multiplayer_no_download.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/ihih8ji/easy_style_dress_up_game.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/jaig1gd/sifidi.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/GAjjvAT/fsu_business_management_major_requirements.pdfIn PDF document text
    • http://matrixbicycles.com/english_to_linear_gallifreyan_translator_onlinemppct.pdfIn PDF document text
    • http://eeeeeyyy.space/kuwaxinolilujiwejizbrfr8.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/gb1jcfj/quillbot_premium_account_username_and_password.pdfIn PDF document text
    • http://avlto.best/barnett_vortex_h20_reviewdyg1x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dunixojojulif.epizy.com/wazaf.pdfIn PDF document text
    • http://japunulu.rf.gd/xexewoxebebukodipigevepun.pdfIn PDF document text
    • http://tinozireru.epizy.com/gulomilosedexakevo.pdfIn PDF document text
    • http://roginopirut.epizy.com/97819146514.pdfIn PDF document text
    • http://zepenolewiri.epizy.com/60376605769.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_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 5420 bytes
SHA-256: 3cbf150bb0c4db6b51ab2a220df67f9027194d13dd3399f4eb8b66412d28ad93
font_01_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 11904 bytes
SHA-256: 2412417fc03aecf291d100803a8d8a9e06b0c11977ec8ee178c0b7793d3c0d41

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