Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c50a13e50991e6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-29 01:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f382c5d0169b9e5e53ca2f170294f345 SHA-1: 3f16f45af68186b243392acac4a2966e345f6758 SHA-256: b8c50a13e50991e67d01cbf02a99a09b1a3d57e6e6932eba482958338be02cd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable domains and structured as a link farm, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, but the overall structure and URL analysis point to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=a+quiet+place+on+hbo+max PDF link annotation
    • http://purofirstli.com/userfiles/files/46502535003.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/dunodimitenifolubagowo.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/51603597116.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/13176899815.pdfIn PDF document text
    • http://kimvu.vn/uploads/files/kojofaxurovanuwa.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/39794195340.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/77329044251.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/gilezobi.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kezumijo.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/lifarabeviremu.pdfIn PDF document text
    • http://marvdashtonline.ir/userfiles2/file/papuwaxivuzawunosunezef.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/devexedenada.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vasajafere.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/63524011156.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/75413571762.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/70533156319.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/1655400992.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/50322393771.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/zukojebasilejexunoxalato.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/tobajuzapakarekepu.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/dopolugowebilozupojujujat.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/movemofepirukabirapexa.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_off0000b2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABC 10840 bytes
SHA-256: 79456d28e4ad512d9173ae64813b9e6cb3fcb68a37d48ef88dc4370631b972d9
font_02_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 19332 bytes
SHA-256: c801bcd40605a432268de20d69ba4d5334c01435ef44a81b4ba5351f70924665

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