Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb011c371847240…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 04:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 128b4df5d70aa184661bb8384f389176 SHA-1: 7662c9f6d965da221d2b7f1d8ecb6dbf0f04bbec SHA-256: 2cb011c371847240a351f0f1c2f66f41cf9c89a507e8a9b45abe23708fdee73d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://all-vehicle.net/js/upload/files/mabutirutux.pdf In PDF document text
    • http://ronaldtan.nl/images/photo/gugosowuf.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/gomer.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/72156394157.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/51079688489.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/12528969347.pdfIn PDF document text
    • https://wittnebel.dk/file/66743822747.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139caa14f12e---vulakav.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/5736466618.pdfIn PDF document text
    • http://origo.ws/userfiles/file/vemikepiniloruwiwikenobeb.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/nonolakixemawo.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/70658341886.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/15523919477.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/22271996475.pdfIn PDF document text
    • http://dobermanncz.eu/files/zijebezizedoponafiramol.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/57546302944.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/92481893728.pdfIn PDF document text
    • https://negaratoto.com/contents/files/rizeverozulekuzos.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/92433013349.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/51719409687.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/78017594872.pdfIn PDF document text
    • https://asp2.aiwangyun.com/ckfinder/userfiles/files/79108017242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fermi+dirac+distribution+formulaPDF 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://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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 18044 bytes
SHA-256: 66e61ba77a6c436fea68b0ae032fbc38f283f6a31d14e0a2f47b3337fc10decd
font_01_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 10856 bytes
SHA-256: c9f9189703c4056570f2a5db9d6c1d1d757a4323ecbe14916648ef114a376cef
font_02_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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