Malicious PDF — malware analysis report

Static analysis result for SHA-256 f161f1c25355d24b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 04:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4302e17c058b5ec7580cfd261357caf SHA-1: a6290f98d620be9e0c1c801455a2bd0a138fea03 SHA-256: f161f1c25355d24bf1b6750a5215b7f2997af699bee21f6761d5df38e753ecfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous embedded URLs, including one pointing to 'smidgel.ru', suggest a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=gta+5+cheats+ps4+phone+super+jump PDF link annotation
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/gilid.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/topunidigufukuvi.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/gaperepegijefanuda.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/jamogojeje.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/xubavog.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/27735129849.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/34952241271.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/67107096945.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/guwigapezijufu.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/melolafapisu.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210907_7A0FF4C36D204DE1.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/bixatoneruletadaturud.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/cd42815ac4763fd5b53c3ca89258d105/nedajinakakeji.pdfIn PDF document text
    • http://packturf.fr/files/nitegusirefitivewasusu.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/2216107565.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nulifujalugox.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/dilopegixa.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/70625017263.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210903225035.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/vumedilumivamofuwo.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/887355f3e1cb90e0d1d6ebe4c635689e/molesonurosoka.pdfIn PDF document text
    • https://bunianco.com/other_files/File/ripokofivo.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/wixoboligawizeb.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210908014533.pdfIn PDF document text
    • 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_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 10984 bytes
SHA-256: 825a185c00c278f2a46309f82f289b1ce58a98e3ef83d7e1d133de44515cdc60
font_02_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 17740 bytes
SHA-256: 6cafa01bc44f0be441dae9cef5f4fc09683e854460ac636c02776c5ea7f3b890