Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2753b5067bcd6b7…

MALICIOUS

PDF

76.2 KB Created: 2021-04-23 20:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2218b16739e88551ac5805d4019825ae SHA-1: d7d9eadf13d21cb44df2111a8d6a5fe559780401 SHA-256: c2753b5067bcd6b788008c5873f14361778668dde045768d02413565943ca703
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'disposable link farm' heuristic strongly suggest the document is designed to redirect users to malicious sites.

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://kuzutuzo.ru/strik?utm_term=2000+honda+accord+v6+manual+transmission+swap PDF link annotation
    • http://kosolibanun.iblogger.org/what_are_the_9_worlds_of_norse_mythology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_602269d5b6839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_606d680925de1.pdfIn PDF document text
    • http://ergors.space/how_to_setup_a_netgear_ex3700_wifi_extenderipp0z.pdfIn PDF document text
    • http://kupiokno.su/diccionario_espaol_portuguesd4ykj.pdfIn PDF document text
    • http://flebolog24.com/dr._seuss_books_onlinevuugu.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://smartroom.pro/tulawunaxipoxokuva81s4w.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/clinical_laboratory_science_review_5th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_603f57a7bfed4.pdfIn PDF document text
    • http://vereffka.xyz/zusivalaminovawulefija0nlxr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_5fe6b455762e2.pdfIn PDF document text
    • http://oneitshop.info/bowflex_heart_rate_watch_manualyl7yt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://soribasosavib.epizy.com/tango_albeniz_guitar.pdfIn PDF document text
    • http://tediguku.atwebpages.com/how_to_load_bobbin_brother_sewing_machine.pdfIn PDF document text
    • http://rufejawat.epizy.com/weather_report_for_nyc_this_weekend.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f6e7ef-f2fe-4eb3-b57e-fee73109574c/56801687838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2831a605-6f36-4da6-ac08-67771f0feecd/nenimekiwoveme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81511086-67e4-479e-830f-4515d7b7dffb/how_to_thread_the_bottom_of_a_brother_jx2517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0ee51d-4817-4ff0-bb40-486d251a4ad3/rabijadulagara.pdfIn PDF document text
    • http://bevowamudad.epizy.com/blank_calendar_template_june_2020.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_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 5796 bytes
SHA-256: 82fd4f3810a3b1f1157b8720857719fd9a17f0536f716b7199d732d1921ba492
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 10496 bytes
SHA-256: 45ea553cc4680ba5eb37d3382a5883cda36919fcdd83c85e3a17d1547a6d7539

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