Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79179de8b6ed9d2…

MALICIOUS

PDF

80.6 KB Created: 2021-10-17 06:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 677651f35ad3676a86f17ee5106ad1a9 SHA-1: afa75b94012b1488524b5984c05468dded6b1dcc SHA-256: f79179de8b6ed9d202442a214e25df21a6d0d76813ad4a354ad274e500c490d9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a potential invoice lure. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely a phishing or malware download site. The use of multiple disposable domains for hosting PDFs points to an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://italiangreyhound.pl/img1/userfiles/file/51305698744.pdf In PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/60372927634.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///73061964147.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/kijepupebitalotagoxil.pdfIn PDF document text
    • http://normel.org/files/upload/file/dovegupokupojiralap.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/65526094979.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/33655502350.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d48428d6b0---kulebanugikutulevuxilova.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/15779612970.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/32463354884.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/kitozosopunizunisel.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/difulogeme.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/59914021947.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161647161207cc---5093183797.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/ca253958cadc6b974f2a966e48563397.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/62428175652.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/kesepojekavosulebefiwabup.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/xuletixebadepawerewilebef.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/50091827661.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/84356679392.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/41006089276.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/wixixegezaj.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/EqozwcbAC44/uplcv?utm_term=a+letter+of+understandingPDF 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_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 16796 bytes
SHA-256: 8392c9d7fb7fe34e7607af36a594a0048e03a6991b83244574b922ab1387528f
font_02_sfnt_off00011ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 10612 bytes
SHA-256: 5868d2c62b9ffcc3b79ae36f90bf55d3e3a30c6671cd5d23bab9c3163f581856