Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea79fbfc9323a8d…

MALICIOUS

PDF

88.7 KB Created: 2021-09-23 17:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11773a323683f5cc826c3c1e6348dfd4 SHA-1: 181fb7375e72a20592d9b90e84257898f74d5064 SHA-256: 3ea79fbfc9323a8d2fe763519d9a593a49f3fa4a2d58f5ddc4403ffdd6e01499
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=how+to+port+pc+game+to+android
    • http://liluby.com/upload/file/56300790353.pdf
    • http://quangcaosmsgiare.com/media/ftp/file/16381920344.pdf
    • http://poketomecam.com/uploads/files/93418897140.pdf
    • http://www.ambatownship.com/ckfinder/userfiles/files/bujekuvawakolixe.pdf
    • http://dayuntang.com/assets/uploads/ckedit/files/20210918003440.pdf
    • http://hyosangjo.com/userfiles/file/20210916215252.pdf
    • http://hanlacsclub.com/ckupload/files/winapu.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/wamubadexodixewix.pdf
    • https://landbondcorten.com/attachment/file/aaa7fa030c5761f53908236bc798c810.pdf
    • http://shinhwacar.com/userData/board/file/48216639778.pdf
    • http://yummyschool.com/_UploadFile/Images/file/zudukilexaxusirivomisasij.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ab45d5807804a2da36e3b9c775d97be0/nuwuzazufe.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/doresofututeforo.pdf
    • https://miet.hu/kepek/nufakopagutu.pdf
    • http://soles2walk.cz/data/file/vupoxileza.pdf
    • http://pop-around.com/file_media/file_image/file/gulutilisadupekowibumor.pdf
    • http://gesundezellen.de/neu/userfiles/file/73509661521.pdf
    • https://nordavril.com/userfiles/file/14614886768.pdf
    • https://sausalito.com/wysiwygfiles/file/97276392300.pdf
    • http://abarappresentanze.it/userfiles/files/tupax.pdf
    • http://thegioixedap.net/upload/files/kulebafitonawelapet.pdf
    • http://chongros.com/userData/board/file/7021656276.pdf
    • http://erdbau-rauch.at/49255148580.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f60c.bin
10eda50d31e59275ca331d4cde00fa4867631adb3f660fd5611fa72f7fa3723c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 18188 bytes
font_01_sfnt_off000124b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 16792 bytes
font_02_sfnt_off00013cc7.bin
f011ff5b3d118b90fe2ddc57c0db995738630a2b7d5749535467c0d0f8403536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC7 10720 bytes

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