Malicious PDF — malware analysis report

Static analysis result for SHA-256 78443ffd9676a854…

MALICIOUS

PDF

76.5 KB Created: 2021-04-02 00:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e18a4bc4586d05cef58a278dfd5ae0c0 SHA-1: 918e603b562ebd33060102948185cbed12af6ba7 SHA-256: 78443ffd9676a8545e07148d673b79cd74ba6e0907c73f59ba32a8b86bfce417
186 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 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=krav+maga+techniques+step+by-step+pdf PDF link annotation
    • https://cdn.sqhk.co/kigimole/jahfgj0/space_live_wallpaper_hd_iphone_download.pdfIn PDF document text
    • http://upsbox.ru/mokadiwexonegotogakiduohrz6.pdfIn PDF document text
    • http://copyright-infringement.business/jigaze1ipis.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/jhfMvje/fepozekeso.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/6hghgFC/jelly_beast_battle_simulator_sandbox.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/13xjc9e/mx3_pro_manual.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/3ff716a.pdfIn PDF document text
    • http://hrushch.space/nitijigukogopabaxoz802.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/10880771177k3q92.pdfIn PDF document text
    • https://cdn.sqhk.co/gixegusu/jqiijj3/fps_air_shooting_fire_shooting_action_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/dhejjgx/71209091662.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/Chg9Ngh/rolle_switzerland_time_zone_now.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/c89975d550c8.pdfIn PDF document text
    • http://filemarker.store/homographs_list_for_elementary_studentsznykc.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/ohfkieQ/kesulitan_belajar_membaca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_dd503e1c0ff2492db9444bc8bf0e8bc8.pdf?index=trueIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_717cccc945cd48afa70717129150dc78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1418abe-fc92-4963-89aa-76bff85d6c6d/telogagisozeluvokevepen.pdfIn PDF document text
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_72cbf2b1648c42219ed82855339a2dc9.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_c6191173c5cd42388ccd3d8ad93df9e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ec9c0b-71f1-4569-8433-f0815f95ea3c/the_stand_movie_2020_cast.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_04e350b3c10945648d5c1c31fdec7b58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22745d2-4cfa-4859-a559-f673b6190ade/oracion_para_encender_la_corona_de_adviento_2020.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_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 5964 bytes
SHA-256: af7f95b8e1b3d10817179e286109f3be656eec19710584d39f47fb3861e3f0e1
font_01_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 10956 bytes
SHA-256: 54124ad91c2de159bdc900e7c8381e0ffea1b392d4945350dce8a8b1f3fce493