Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b437f85f52cf6fc…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 10:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd8b7d979209d5f2b32444f0ea04c37a SHA-1: 7a51e82043a8434686f67cf26ec6b8a171239de3 SHA-256: 8b437f85f52cf6fca51263339be385d53a20b74ae833bb636d7824cc7b3694a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to potentially malicious domains or link farms, suggesting an attempt to redirect users to phishing or malware hosting sites. The PDF structure and embedded links indicate a likely spearphishing attachment used to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/efd90652d5aa3b7f63fac819088ed7d0/83369952818.pdf In PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/58115582254.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16139677b56a83---96813048426.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/43279958061374b32aa2b8.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/rifeselizagazixemaf.pdfIn PDF document text
    • http://e-district.org/userfiles/file/45507316943.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/muxigoporogu.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/zulobixotigakob.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/gafufapaworopalad.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/zawuzebufan.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/41973158870.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/54335500786.pdfIn PDF document text
    • http://mopron.ru/upload/files/monixilabeletapakamewetim.pdfIn PDF document text
    • http://bronia.org/userfiles/file/fewamewo.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/13460691898.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/23255880650.pdfIn PDF document text
    • http://htygroup.com/upload/files/lagapajapolor.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/33819442244.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/23598379423.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9tj43spht21ri803qqjgcjme9t/56497239719.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/80961823677.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/92551917557.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/pimuxufolusumemitizup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=watch+aladdin+2019+online+free+putlockerPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 11196 bytes
SHA-256: 0c292afda2f164d95890036419cea07f909134590ca3db880e416fbe77be277b
font_01_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 18348 bytes
SHA-256: 90a05db89d6a586e4da0d8d016c738077a0169c189bdd027391498279e9b7001
font_02_sfnt_off00012dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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