Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d74b5e4ba3dc11…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 02:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b48397717bd4473c0ea050e7daf89a51 SHA-1: 71834ae07ab5fac6a1280fcaab5259ec3644db27 SHA-256: 77d74b5e4ba3dc11cda56c72aae8c19057c885be46ec2bada6fbec5d4da1df3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various domains, suggesting an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://iveducentar.com/uploads/assets/file/nokukidotiwesapesewed.pdf In PDF document text
    • http://bakoca.hu/files/file/21214740950.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/68671792396.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/tukeduvepipevowona.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9adc684a---67780177200.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/tujesomogulowe.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/87446048549.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630721152.pdfIn PDF document text
    • http://princeverma.in/uploads/files/8418886141.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/fawepisalexojilopetik.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/ramepav.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/21793655772.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/tutigaduzosuduwa.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/jikadimunanozisafu.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/kinax.pdfIn PDF document text
    • http://unsersohn.ch/images/file/wipawuzipesaxeligepaz.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/80237927485.pdfIn PDF document text
    • http://saint-party.com/media/file/liwakuguwamosin.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/54413461487.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/38993757369.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/vakipijukifipaf.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/vedotijinilavuzajabax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=google+voice+search+shortcut+androidPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/mixezurekiduvunu.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://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_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 16780 bytes
SHA-256: 4435d16477a9d8e3bcae769a725453dd7d1ff4f2e5844e3b0cad9a32525b4ab3
font_01_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 10856 bytes
SHA-256: 1e26442e463662eacfe06936c031cc46ea3de8d496b59437eb11c3c770cc6435
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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