Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a1af0a8978e53d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 21:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d0d2d9071bf2838f5a08da46264eeae SHA-1: 60264b27ec78e1b497d60e34b1e9023b8f40a270 SHA-256: f9a1af0a8978e53dea5e190df7c08ff9654af4efa16e0aa7a65ca28e9008ac00
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. It also features numerous external URIs, many of which point to potentially malicious PDF files, suggesting a link farm or distribution network. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://ahzgbh.news-read.com/upload/files/rerozajafoza.pdf In PDF document text
    • http://constantcontinuity.com/membership/data/files/memupugowijatabev.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/wulezakezuzugeloketivafed.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/56152493652.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/53005497296.pdfIn PDF document text
    • https://citytrafik.nu/images/file/99386932982.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/47629368807.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3ii3icn2tjupi4l9c601o1cc11/88417674335.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/26941708044.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/dukagaba.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/gitesafawogisi.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/nuzutixoxekodo.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/32324502691.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/pozovazajelowazotivemon.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/musibokavufemubugidugasu.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/jugaguk.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/354ddffc4856c5edf404642a610b208a/45596133378.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/gisezolijivoxad.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/18856920817.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/40355463455.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/nifixonikeriputiviwajotus.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909041308964186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+watch+american+idol+without+cablePDF 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_off0000af6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6D 10784 bytes
SHA-256: a8d350634eabbc75a5cd274e7b35d4d3b363db0af53a8991525638208d404a4f
font_01_sfnt_off0000c807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 16456 bytes
SHA-256: 60331618d4eb1f356e8f14d04a5ca39d53e96eba22ff0f8a1184ef4699408478

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