Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fca3ff824924368…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 00:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6d322123fe3aca73995e2d59b7547f6 SHA-1: 038f59d0237a0de8f8cd90005d2936fc72d931e0 SHA-256: 1fca3ff82492436813bc478fbd6d71e6b42986253a17ae5167a9ba34aaadff82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are used in link farms, suggesting a phishing or malware distribution scheme. The PDF_URI heuristic specifically identified an external URI that likely serves as a redirector to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=155+zl+to+eur
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/85619844260.pdf
    • http://canvangdientu.com/images/file/63097908860.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/kuzonalez.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/1835eee9577377c99975edff261a2feb/zilubira.pdf
    • http://medwin.kr/userData/board/file/46167241955.pdf
    • http://0851gay.org/userfiles/202109file/2021092020302970554.pdf
    • http://cellesekorea.com/ckupload/files/zazapapogasifinaxixosifo.pdf
    • https://institutdesante.org/userfiles/file/tuvuvanedumilere.pdf
    • http://vanprodukt.cz/UserFiles/File/toder.pdf
    • http://canxetaianhduc.com/images/file/mibep.pdf
    • http://norilsk.torbay.ru/images/uploads/file/lakatexamoxegomatudabe.pdf
    • https://lawyerupsmart.com/tempimg/file/45195545962.pdf
    • http://cozycornerexpress.com/uploads/files/rutopujowidimew.pdf
    • https://laetitiabernard.fr/images/file/mozunedewusomiduvedeka.pdf
    • https://wic-net.com/userfiles/file/ralof.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pavemesodujuzixinakidome.pdf
    • http://asiancfea.org/userfiles/file/nejefezubu.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/foxejezeponuruzu.pdf
    • http://tsrmmessina.it/userfiles/files/pudumalazulufikone.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16156afab1daaf---8979103539.pdf
    • http://fbrasil.com/userfiles/file///defofopaderugefab.pdf
    • http://muacuoi.vn/Pictures/files/vixawibujobum.pdf
    • https://sankaibearing.com/userfiles/files/14234895154.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_off0000b297.bin
6858ccdf29999fa28512c1876726294e8c3e76945dcd50627072c1ef5698a854		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB297 9824 bytes
font_01_sfnt_off0000c860.bin
71b5e551c33fe4a5cd8c285f8af51345ffd4dba239f9bf04db1c078c9a938b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC860 18224 bytes
font_02_sfnt_off0000f7b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 16792 bytes

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