Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa7df3f2194aedf…

MALICIOUS

PDF

80.6 KB Created: 2021-10-14 00:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cabbece41a1e042d482bfe6069ae69da SHA-1: 8256d23d15a2ee22673d102a659d5811da0bd747 SHA-256: 1aa7df3f2194aedff62bfa797dcaecebb1582760d2fd9df2fdc5d5bc072fe40c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, likely for phishing or malware distribution. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aneri12.cz/res/file/rupupogilotabinivubirune.pdf In PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/85242695622.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/rewodobudif.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/13404799347.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/31084931766.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/wudutivutez.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/xoduge.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/87040499973.pdfIn PDF document text
    • http://khocabien.com/uploads/files/vefakafebesiva.pdfIn PDF document text
    • https://taperagi.com/contents/files/xejubonera.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/73377891329.pdfIn PDF document text
    • http://hainfelderteich.at/wafufoda.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/nemulubuga.pdfIn PDF document text
    • http://okvin.org/userfiles/file/zejolinatimisizidu.pdfIn PDF document text
    • https://combrooncom.com/contents/files/47452170356.pdfIn PDF document text
    • http://cuanhavesinh.com/userfiles/file/48513243214.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/todijizibemufexorujumiti.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/pomogun.pdfIn PDF document text
    • http://manhtreminhduc.com/webroot/img/files/55712198924.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021101323482380554.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161663b8327d98---fidafedukudepemigewus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498a141e3d---31749899942.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BcFPVxLj4jw/uplcv?utm_term=6+feet+2+inches+in+cmsPDF link annotation
    • 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_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 17436 bytes
SHA-256: 21f165f008a273f67b6255c297e18bdb08633ac8cfe8b4ec78d3ba72d8ea8ca3
font_01_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 10364 bytes
SHA-256: f37f787ec28ecc0224e50bc9c96bcae03bfbb91561061f17c1b823574f5fcee6
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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