Malicious PDF — malware analysis report

Static analysis result for SHA-256 66288230e7ca7080…

MALICIOUS

PDF

76.3 KB Created: 2021-04-30 19:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 870c1e2c3db7cec2337d9d058146a096 SHA-1: 53d16d8a2a8fa49edcc0f6ea6f5d394849fbc1f8 SHA-256: 66288230e7ca7080eaff0fb2081b837d9fcb3f45f5036b7fcc9bde85cd321b19
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=elgato+hd60+s+setup+ps5 PDF link annotation
    • http://laura-egorova.ru/action_games_for_android_uptodown48rm3.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/4NfrhhZ/34012274909.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/4499279.pdfIn PDF document text
    • http://vittorguxx.site/pudemexaratipunozovumelorr9xo9.pdfIn PDF document text
    • http://tizezs.xyz/8392442978bhzyx.pdfIn PDF document text
    • http://fortuneo-enligne.com/best_workout_dvd_for_seniorsw91ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386080/normal_6054eb7d4cf6c.pdfIn PDF document text
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/1c31c4d248d.pdfIn PDF document text
    • https://cdn.sqhk.co/fetuxudo/Cjhhcgh/30061829433.pdfIn PDF document text
    • https://cdn.sqhk.co/xozifejor/nkhajiR/open_camera_on_iphone_8.pdfIn PDF document text
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/4c24d508b8.pdfIn PDF document text
    • http://artyom.guru/ladisije73r4k.pdfIn PDF document text
    • https://cdn.sqhk.co/pudamunipum/ijbii7R/complementary_angles_worksheet_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_604a886b09c0b.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/hghxhbi/78817609819.pdfIn PDF document text
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/3288996.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/j9id1ig/computer_all_full_form_list.pdfIn PDF document text
    • https://cdn.sqhk.co/vawikepaf/ggmibgc/59401530063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_efcc3cd137224146bc22d2440851dad7.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_d94d120de8134b13ad25568711e3a0ef.pdf?index=trueIn PDF document text
    • https://bf2b7b75-7790-49a7-81e6-d2546e692b42.filesusr.com/ugd/8ccf63_f0de913f5ff245d69565580bdf6a222e.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_7e1d28930d6b4a279dbf2f57ec10b9b1.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_88b8473584bc404e956c9bb99f3e28c6.pdf?index=trueIn 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_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 5504 bytes
SHA-256: 266b03789a0075e90a18a8b5d1d5fee1ba1c79130f25fefd5ef4d677aae588d3
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 10980 bytes
SHA-256: 507f7468516b17adb9ce1b67b59aafc7e21da55aa6972f43628ebaa3445ed39a