Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e24b91ad01136c4…

MALICIOUS

PDF

88.6 KB Created: 2021-04-13 12:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4d67d028d4873093dfcde66892760898 SHA-1: 90ab3a32f48cd211fcbd4460f24072b4ef4b41aa SHA-256: 6e24b91ad01136c4c10f50d4160815a5e528e59f89f04781109e60df8b278a07
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting and potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this as malicious, suggesting it's part of a phishing or content distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=john+deere+2650+4wd+solenoid PDF link annotation
    • http://xuputunoxukir.22web.org/29573113520.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/PfibXha/38363051103.pdfIn PDF document text
    • http://sakipewo.22web.org/game_playing_card_template.pdfIn PDF document text
    • http://xomofaki.getenjoyment.net/kikigipa.pdfIn PDF document text
    • http://a1metromovers.com/bias_fx_2_freela1ky.pdfIn PDF document text
    • http://thecet.xyz/fios_dvr_keeps_rebootingx8a7y.pdfIn PDF document text
    • https://cdn.sqhk.co/voxobidivel/ihgjwIa/cafe_racer_seat_hoop_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/gdoxiab/nuwax.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/axiom_61_factory_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdfIn PDF document text
    • https://cdn.sqhk.co/bafebolabefo/c1ihjgZ/bmp_design_manual_san_diego.pdfIn PDF document text
    • https://cdn.sqhk.co/judebivon/jejaOjj/celemony_melodyne_4_studio_free.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/vomezazoz.pdfIn PDF document text
    • http://mon-cmbretagne.com/neverwinter_best_class_for_drownk1d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_f45af51337bd46cebcc307bbd1cf4b36.pdf?index=trueIn PDF document text
    • http://zuruxiwowasigu.epizy.com/bill_ackman_herbalife.pdfIn PDF document text
    • http://nimunofat.epizy.com/bodyguard_movie_hd_filmywap.pdfIn PDF document text
    • http://ruraruke.epizy.com/bihar_tet_question_paper_download.pdfIn PDF document text
    • https://6a543b89-810f-4a07-932c-4cc129fc401a.filesusr.com/ugd/1e5726_23318f5f998b46fc91dd77b63d432db1.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_66f2b7c0dfad415db2236e8c7fbad5aa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 5132 bytes
SHA-256: a766c23736bc32d44dc6e43b9eeeca4822bb4c7bac3d0749be7b311f6dc62e85
font_01_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 11324 bytes
SHA-256: a83a26676b40527657dcdf77c1e56640339d89687612ed0448626a68ad1794a6
font_02_sfnt_off000144f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34