Malicious PDF — malware analysis report

Static analysis result for SHA-256 227c15be17f6132a…

MALICIOUS

PDF

92.4 KB Created: 2021-09-20 16:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f76ef95454f25613232c7d556b0b92a8 SHA-1: 67d4546d9a2183ac558466fa27af2714cfb44615 SHA-256: 227c15be17f6132a58db1e2a6854d8b942e4bcc037338874da5b0feafa88e4ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a specific rule for link farms on disposable hosting, and a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The numerous embedded URLs point to a strategy of redirecting users to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://archism.ru/uplcv?utm_term=grow+old+with+you+uke PDF link annotation
    • http://dienlanhtruongson.com/upload/files/82703674017.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/34470480055.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/jakepazupekorimitepibav.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/20222604005.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/14388929120.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/mexoraguwukubo.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/wazotaf.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/gudabo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613720ab24158---fefab.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/58689160428.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/ditaxolusixedaf.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ce157cdf---dogixozulot.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/61121848045.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/xoperivijevinelitazobug.pdfIn PDF document text
    • http://tradotel-riviera.com/file/14505701044.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/39478837083.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/32897471915.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/40258961931.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/52099553327.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614337930f047---woruritazutaluvinaba.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/fexidoga.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/linup.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/fujirusedesakegegolej.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/22930084686.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210901222811.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_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 18140 bytes
SHA-256: 9a6d6b5b40f95cf7e467d420d6380b03a5fd650435c7cbab50b46e416b13fcf9
font_01_sfnt_off000134e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF7 10340 bytes
SHA-256: 47c53ce0da35d463dade1f5e5df71bb2174a83e265fa4e3dea378232942028e2

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