Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea0e7544eeb5904…

MALICIOUS

PDF

71.7 KB Created: 2021-02-25 05:22:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cef95190879e9c34b16a85720bbfbab1 SHA-1: d3849fc19e85f9f8c657c16c9facc82187534eef SHA-256: dea0e7544eeb5904b3e8a263678784823d3992647c51b65f05761d1bd5b2be06
126 Risk Score

Malware Insights

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

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://crophysi.ru/strik?utm_term=us+polo+assn+watches+price+in+sri+lanka PDF link annotation
    • https://cdn.sqhk.co/rasepotobami/fjihggf/talexosepafasewi.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/pjgjiia/bajalodufifunexuwavok.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/what_do_you_talk_about_in_a_safety_meeting.pdfIn PDF document text
    • http://magicwoolshop.com/compaia_botanica_libro_gratisly1sf.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/msoe_nursing_acceptance_rate.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/how_to_turn_on_landice_treadmill.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/Etgg5SA/vemotus.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/hQMgjjd/60010609692.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/sidFje0/bunopigifizurufowo.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/sZiajdq/gafebomes.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/2gig_change_master_code.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/xekuli.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/sTIjfIu/pop_rock_80s_music_radio_online.pdfIn PDF document text
    • http://itclick.info/ebira_news_reporter4sgje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavibajegis.onlinewebshop.net/lineas_horizontales_y_verticales_para_preescolar.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/bazaar_2018_hd_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/math_word_problem_worksheets_for_2nd_grade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA3 5168 bytes
SHA-256: dc48f3715b1d733c9a034d6c08e697de7edb793ce9811e91fae8ef2011f98fc3
font_01_sfnt_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 2604 bytes
SHA-256: ac4cc3b212df22f2cc3f27a2b3c1c69294510693291fd97da43414e5590daea4
font_02_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 10916 bytes
SHA-256: a505fb92a53d8e4efdace8d0e3a0245121d44768b3542b51520a42933da74640

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