Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb116db38a0beb1…

MALICIOUS

PDF

77.5 KB Created: 2021-04-02 19:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b332ddd125c7fac9bf5052ad67fa3bc9 SHA-1: f499bec98359e33410dc89211e2c30ebc0272efb SHA-256: fcb116db38a0beb13c447586c2517e09217dcb1d706cbf42eeb433b3c365aece
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to trick users into downloading malware or revealing credentials. The ML classifier and ClamAV detection strongly indicate malicious intent, and numerous external URLs are present, likely serving as landing pages or payload hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://midufefew.ru/award?keyword=personality+types+pdf+download PDF link annotation
    • http://sutiboju.sportsontheweb.net/wurofevosiwisuzano.pdfIn PDF document text
    • https://tewizoduwab.weebly.com/uploads/1/3/5/3/135341898/9663727.pdfIn PDF document text
    • http://qrettalq.online/391375212605ootq.pdfIn PDF document text
    • http://bawoputameded.iblogger.org/sifelujonuxobikufedexof.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/chapter_7_cellular_structure_and_function_test.pdfIn PDF document text
    • http://indital.space/sujalinozaal2.pdfIn PDF document text
    • http://forexgeeks.net/kubimesd23ly.pdfIn PDF document text
    • http://rabota-plus.club/the_boy_in_the_striped_pajamas_movie_plotkgzj2.pdfIn PDF document text
    • http://gamedv.design/lg_ductless_mini_split_air_conditioner_reviewsmj4u5.pdfIn PDF document text
    • https://tewodoxes.weebly.com/uploads/1/3/4/3/134368692/gejukofamavi.pdfIn PDF document text
    • https://jufapagemegugux.weebly.com/uploads/1/3/4/8/134860181/rixavinapoxeri.pdfIn PDF document text
    • http://forexgeeks.net/63663760165n0w0u.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/jomojutevawejokurit.pdfIn PDF document text
    • http://galajikimozupu.iblogger.org/tekebalukepumarezafelid.pdfIn PDF document text
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/xilofotemago-fasizinajex.pdfIn PDF document text
    • https://luxelekite.weebly.com/uploads/1/3/4/6/134656707/vopit-dejovu-lalawoxape-zedovinup.pdfIn PDF document text
    • https://povijovo.weebly.com/uploads/1/3/4/4/134463476/zosofa_rufubiwunezevu_fagum_zexukisotaj.pdfIn PDF document text
    • http://nejugikolivakam.iblogger.org/depeleguxerosiforuduwuvim.pdfIn PDF document text
    • http://bupro.asia/nesumetalia27y9.pdfIn PDF document text
    • https://bezatawe.weebly.com/uploads/1/3/0/9/130968967/jefenarumaratixosib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tulajadulixo.myartsonline.com/honeywell_8000_user_manual.pdfIn PDF document text
    • http://konajif.epizy.com/lanitosupifemowivan.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_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 5228 bytes
SHA-256: 02c97c9056328882b9a1a8695765352e4f67fd361f8dfe6d458eceb9c8efd3ed
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 10688 bytes
SHA-256: 4e8ad569aee18970c5b42061c074294cfa309b1dc61ce3af59e49829a7812779

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