Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd3d2328d521108…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 23:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7bd4cddb7b5aa1d9fd82e59d64b9626 SHA-1: f520f6b0013628e467e3e8925444fd5adae1eb64 SHA-256: cfd3d2328d5211082916c2cea9fa636866d6f53227fd53bcd99e3b259b8575e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. This suggests the PDF is used to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chanakyaaerospacedefence.com/userfiles/file/lepulogot.pdf In PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/rozebikowolosukol.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/44684131758.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d8b29b285d491aeecb19cf0907f6c177/72304309896.pdfIn PDF document text
    • https://begili.com/uploads/image/files/28498296831.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/ditaterutenebubanuzej.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/toratigixipujoxim.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/11165553977.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/54765755948.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/jufeniguzefumaro.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/34597524108.pdfIn PDF document text
    • http://cabini.it/userfiles/files/gewomazag.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/jisowirerunebaro.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/tedebimojolarojikagotuj.pdfIn PDF document text
    • http://hiniceshine.com/upload/96071043028.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/80018353770.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/nipimopituxafibe.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/91858419979.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/jekotasaridunolipepol.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/mafobumozopilatoluz.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/bafokisilejagonamufus.pdfIn PDF document text
    • https://atlantidegattico.it/file/bubixep.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/gabojirakige.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/bigodibogededitu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614923114a776---22522900909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=zxing+qr+code+c%23PDF 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_off0000b4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E1 17648 bytes
SHA-256: 187865b371ed9f3c974b83f3e8145c4db8e52bb3fda53b850486432ec8295476
font_01_sfnt_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 10280 bytes
SHA-256: 96bee6723e768b0cbcbaa8ab15d4b0e60b926870fd320983c7ebf820e546784b
font_02_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1