Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cc724cdf266de0…

MALICIOUS

PDF

81.3 KB Created: 2021-04-01 14:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 77786050070838583a4c763c073c9123 SHA-1: 4132c652b2f0261d9b0194ba9af6b0fe53a79372 SHA-256: e9cc724cdf266de0ed2217ee0bd149dc9a93b801f87d90894d27e101d27ad217
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, and ClamAV detected it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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://ponafet.ru/award?keyword=black+mamba+boy+pdf PDF link annotation
    • https://cdn.sqhk.co/purorelaz/eidvjbN/84437154720.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/abc_medical_books.pdfIn PDF document text
    • http://jidapuxedepu.medianewsonline.com/administrative_officer_duties_and_responsibilities.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_60281cd812ef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_6042008b240ca.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/hd3ifhj/radiant_heat_boiler_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/3LNEjjW/10455987937.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/5480770890.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://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_6bb704f2baef4338a9a9810345210eb0.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_735b55c702434659ac94a2d5c9e0519c.pdf?index=trueIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/75975637680.pdfIn PDF document text
    • http://sujawokasafu.onlinewebshop.net/alcohol_withdrawal_symptoms.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/non_collusive_oligopoly_def.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_bc7c9800c0f64374920ee2caf51287cd.pdf?index=trueIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_ab24f36666864ca99c7b3dba2fd642f8.pdf?index=trueIn PDF document text
    • https://fff5164c-1337-4dca-a870-9ee8129e9d1f.filesusr.com/ugd/11cbe4_f5674f109fd3477aa79365d3031b0583.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_e470269277294981ac1a4b4e8328ea25.pdf?index=trueIn PDF document text
    • http://namepafubi.atwebpages.com/how_to_connect_microsoft_sculpt_comfort_keyboard.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_94cb2ef767f840fe90a006b7ebcce298.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_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 4820 bytes
SHA-256: fc6a9711cba473d0158c4b89247cc4fcb8c345c02f5657594845f9be677924f1
font_01_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 10972 bytes
SHA-256: 6a284ce16a7db65c8c048bdcf0b668a913e768604a081ac1f1951ea70db56fe4
font_02_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333