Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8277f5cd098e675…

MALICIOUS

PDF

80.4 KB Created: 2021-04-25 18:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4782496143a2001d0e8c3f399305e796 SHA-1: 740d7346ddf6a585f589da913f87f402c993ed1d SHA-256: a8277f5cd098e675fa029b438e61524de5fb779b261769116b5e2832110d2924
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a prominent one pointing to 'fokemale.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, further supporting its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=harry+potter+y+el+misterio+del+principe+libro+paginas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379034/normal_60077c0234a88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461751/normal_5fccf7168927c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_5fe9f11fd359a.pdfIn PDF document text
    • http://wdd13.ru/html5_and_css3_free_download5uc6i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_601d234927bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_602e0c4bdf6d0.pdfIn PDF document text
    • http://furniture21.online/wapekiweluwujozoukuk.pdfIn PDF document text
    • http://covidcapsule.world/addition_of_vectors_physics_lab_report2arnz.pdfIn PDF document text
    • https://cdn.sqhk.co/pitewomepe/xTjcWif/nivagazusamepavabadulun.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/13276277159.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/sociology_textbook_class_12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5ff8adc655878.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/63679877675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484605/normal_5fe8a475ab15f.pdfIn PDF document text
    • https://cdn.sqhk.co/wesusogewu/xN3gjSe/cloud_9_cast.pdfIn PDF document text
    • http://evatopshop.xyz/regogoviris4qyig.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/cLgiDhb/can_find_switch_pro_controller_to_pc.pdfIn PDF document text
    • http://idealica-italiaofficial.site/xobijudofi0m7bs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuginovotaroni.epizy.com/tivoji.pdfIn PDF document text
    • http://lodonevubepivor.epizy.com/arjun_movie_songs_free_in_tamil.pdfIn PDF document text
    • http://ninovaxabax.epizy.com/accounting_format_excel_definition.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/rewriting_logarithms_practice.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_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 5596 bytes
SHA-256: c6465db4df90ec180e650ded062440dd108328795529fd0c819ca75a3bc0a0a8
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 11800 bytes
SHA-256: 0a76d19805acad9c7d1272bd800d4936225881606e4cb6f4395df55cf68c1927

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