Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e8f8c8ad90b744…

MALICIOUS

PDF

82.0 KB Created: 2021-10-07 02:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0896dfbe8ba56dbcc40d75519f286415 SHA-1: b8070556ef97c3205fcbf7c91a989b76f10012c6 SHA-256: c8e8f8c8ad90b7443d2491776f89c899ef546796620b6cd280aaae63a6e5dc06
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the PDF is designed to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=ideal+down+payment+for+a+house PDF link annotation
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613909122c22d---35713128517.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/gefosijevigivudoxofomumiz.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/25441075536.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/famudopagufiwoxovadiro.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/62326651113.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/24186080326.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/26247130736.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/85158866497.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/tugabetotozezule.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/jemukusobefagasiwopov.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/72182637995.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eed9ee8321---45599050078.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/79202727926.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/23605846734.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/22244128592.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/13065239223.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/tobux.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jalep.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/futafumivoloram.pdfIn PDF document text
    • http://trivio.it/userfiles/files/kuxodekox.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://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_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 10920 bytes
SHA-256: fec5cb5208b236e79e7ec2e7e14ebed54ff45e6ce4279827222891193864a8ef
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 18156 bytes
SHA-256: cf625057a250f367dd94f621051e11c8748056da9f4073a91e187b4e41de462e

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