Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ef5acb3897ae66…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 08:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: beee78154a8bb4e166c2bbaa1e9c7d7e SHA-1: d0f13b20f7e3d31b92cd8f813bef960c4cd8a744 SHA-256: c0ef5acb3897ae661ae10eda1edb38c7aa900f06a997511dd47e66db8dad7020
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, particularly one leading to a 'gta san andreas apk hack mod' download, suggests a phishing or malware distribution lure. The document body, though heavily obfuscated, contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

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://inwebjor.ru/uplcv?utm_term=gta+san+andreas+apk+hack+mod PDF link annotation
    • http://centromedicoveterinarioadda.com/userfiles/files/3048814148.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/38914837491.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/3401939687.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/33272555635.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/99535174492.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/tifagobupapuvomu.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/gejarokaxud.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/komumiruwodumasosuloxumi.pdfIn PDF document text
    • http://17njl.com/userfiles/files/90080092706.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210902_81187.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/58991809038.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/didosefoza.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/65021222653.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/xabebi.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tulako.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/likozusutakuwujutu.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/robuwubazagi.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/visibuzewu.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/nasowijibolof.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/76876497187.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/sokodilovizolafufejajilez.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/fozemamuxekuparakarivuwa.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134d60d79483---lojiw.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa364ad9a1---waginuzonisanebewopep.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_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 10772 bytes
SHA-256: fd58ce70e029f060347b02832c335446ee0532d8c7ec023659cf64150b1cbe61
font_02_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 17768 bytes
SHA-256: 500ac699312b4b4a42944886ba1710a40cc6446655c8923b0aa891e6da8ccfc1

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