Malicious PDF — malware analysis report

Static analysis result for SHA-256 f446df873675d516…

MALICIOUS

PDF

89.4 KB Created: 2021-09-13 14:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4788b364f6e28d64db676a7755ded85f SHA-1: 8fc0c6566f29fe91b6bf2a81c673a59317d66128 SHA-256: f446df873675d5160bc41d0598576a10146af80797a1db7e4b8a41a4c0b83cb7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 http://toyotaprius-custom.com/js/upload/files/64811236185.pdf In PDF document text
    • http://tw-sincere.com/upfiles/editor/files/73549583376.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/42504202982.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb25292710---75901878716.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/10080740057.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/87099958525.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/zepaxezorivuzup.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/42956996009.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/febatoxumamotex.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/fafafawofaxivobuxukex.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/mogupajoxegamaridozali.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5014036c2---nerekuteresoxusedi.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/95403126325.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/63370952267.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/zegotif.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/sumolexazibesorakinuli.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/80515137039.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/31471761332.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/43154244295.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/vapenivob.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/67419593157.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/torofetizobiponumip.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/bojerojulubelologevuzapi.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/74548461223.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/62968831170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=usb+driver+for+samsung+galaxy+note+1+gt+n7000PDF 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_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 11452 bytes
SHA-256: 0dcdcd6a7ad27ef6deae5d02233f5248805ecf36ac518a7d4500146a2fdaf6b9
font_02_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 18132 bytes
SHA-256: 84f086ce4dc0099f39191b789a2451ab079cd38905d47f0ba9d168264cb4465b