Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7e7d8f2377d210…

MALICIOUS

PDF

80.9 KB Created: 2021-04-05 17:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c3bcd624160292e96167ba5e54277c7e SHA-1: f0f0e268d6d101521be14d0b8c213a2e8c736964 SHA-256: cc7e7d8f2377d2106391f7d6e6723dd5e1190805acc21a33f7d2c8455747555f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=star+wars+the+high+republic+comic+uk PDF link annotation
    • http://klossheff.xyz/what_are_the_4_requirements_for_a_valid_contractfgqbo.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/cdihv6X/43678809832.pdfIn PDF document text
    • http://samelike.site/cellular_respiration_online_lab_answer_keyqmox7.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://gelixilononusi.weebly.com/uploads/1/3/0/7/130775878/a4096914098835.pdfIn PDF document text
    • http://powerhdniy.space/melinotarinunaxakusewoxej12azx.pdfIn PDF document text
    • https://cdn.sqhk.co/zelosoza/IyhhJgc/86761843810.pdfIn PDF document text
    • https://cdn.sqhk.co/kixalixu/wPjaice/client_reporting_accountant_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/jehgey1/goluludoperukazij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471095/normal_6019f4c75637f.pdfIn PDF document text
    • https://cdn.sqhk.co/tosaporafoxa/l8de82n/the_accidental_tourist_anne_tyler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_602bad59708e1.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/iiZEP0F/47256832471.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/ajjcieT/car_race_free_top_car_racing_games_online.pdfIn PDF document text
    • http://meriline.store/17305122446vlct6.pdfIn PDF document text
    • http://trenketo.buzz/literal_equations_manipulating_variables_and_constants_worksheet_answer_keykqghp.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/hgvkBif/alchemist_code_halloween_sugar_rush.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/dd0e712c3d42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_604aeb7cc85e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 5748 bytes
SHA-256: 21198283c6dfb295b68ed95b2bfb4b28250d903766a52c325dfdf66bd058e1aa
font_02_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 10956 bytes
SHA-256: 3c2a25298f729cefcd0641cec5857df77643706e5ad148bd266a8e7358351f7f