Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74c5b84c404b7c5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 21:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 921a2415e03fd6dd6fc47b1d24f86886 SHA-1: 42db7455d6fcf4904fbefc299f427cd6bbb6b64d SHA-256: e74c5b84c404b7c5c698678c86840dae52edced959b79cf1e252fd200044f04a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, with one specific URL identified as a potential lure related to 'android emulator for free fire'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links on disposable domains, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chcial.ru/uplcv?utm_term=android+emulator+for+free+fire PDF link annotation
    • http://zae.me/datafiles/file/nopuwa.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/nivavarabixuk.pdfIn PDF document text
    • http://becucci.it/userfiles/files/54967292148.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/97689035418.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/64743055519.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/59301858399.pdfIn PDF document text
    • https://geloracinta.com/contents/files/rekidumogobuzuvufel.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/27328021596.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/44120683081.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/32409054081.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/votevupevaso.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/xusezego.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/39857067866.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/16084290200.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/30606113184.pdfIn PDF document text
    • https://amgaa.org/temp/files/kejawuvonexojiwuf.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/05a5187f8a7d5df0a37b9ade67910e64/zuvamir.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133bd1458372---ditivepegoviw.pdfIn PDF document text
    • https://petribax.com/userfiles/file/jaruga.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/53414351579.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/1206210057.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/sigewuret.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/xomelo.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/83049574890.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/69887526.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/fekiroposepas.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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 16552 bytes
SHA-256: 03e037a76ba687ebc6d25fc7bda6483c8d93f63ea390a2a3e9a24e3ca14e8aee
font_01_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 10428 bytes
SHA-256: ccd195b2005fb1f709d1545d44105620d0424ed1ce801bf6f3aaeda93dc05a70
font_02_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1