Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51501775c2329b7…

MALICIOUS

PDF

82.9 KB Created: 2021-04-11 13:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e03fab0c8f8219d53e2376ad04fd8cab SHA-1: df0aa01a4159b4ac1de509df843966a55b8d6181 SHA-256: c51501775c2329b7e7a5d3aca85e0605ebb7ccda5eebbf1a46cf010ea490d47a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing the user to 'fokemale.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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=caballo+de+troya+3+pdf+completo PDF link annotation
    • https://cdn.sqhk.co/kewukapugino/b69EN2y/fatilidesiripetinoga.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/ghbjjia/71972889273.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/5agj8jb/white_metal_platform_bed_frame_queen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484639/normal_60140a82bbdd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445334/normal_6026133fbcd72.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/xejin.pdfIn PDF document text
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/9778018.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://xolejapu.weebly.com/uploads/1/3/4/4/134491856/fojupozidojil_jelonewosuvi_dubuxevomazusi_zalesasokaj.pdfIn PDF document text
    • http://qqkaxes.xyz/guidelines_for_preventive_activities_in_general_practicesc2ns.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/nefovevixavo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fc6d70300de3.pdfIn PDF document text
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/8a1ba956319789c.pdfIn PDF document text
    • http://forexgeeks.net/8217934935l9wav.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/fhihext/100_sound_buttons_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_6cfca022fa024f478648f0fc5ab2fe26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/39520450268.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/book_review_of_20000_leagues_under_the_sea.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/when_did_schools_shut_down_for_covid-19.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/broomfield_police_incident_reports.pdfIn PDF document text
    • https://5b4dac29-bb7d-48a4-8b57-1120036b5257.filesusr.com/ugd/2d1648_9129d79f347f4d1586825979ce1665e0.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_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 5436 bytes
SHA-256: 0e01a4a8669d881888387b74d8cbb2d1cbefcdaf9ddf93af814998ca6bca588e
font_01_sfnt_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 12176 bytes
SHA-256: 3ef2767edf65c16842474e43f89059a8d78f03015279b563256ef45135f2bf05

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