Malicious PDF — malware analysis report

Static analysis result for SHA-256 80830240b739412a…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 15:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6482208e43e34383fb3831407ff51c4 SHA-1: d23be02edeee973b0ad99342755fc91558d07c98 SHA-256: 80830240b739412a1dbb956c343c43598abc867260b9b8cd3c775803aa07c439
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of numerous external URIs, many pointing to PDF files hosted on potentially disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://orsam.org.tr/paketler/ckfinder/dosyalar/files/88251359623.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138faf5243b0---fasutonax.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/44428011653.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/38118494910.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/40650546015.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/likafuwavezukezuxedorabin.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labejinerinamakul.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/8058775283.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fugopijopogizuzemefepok.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tixodarolexagazeto.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/vefuterunaripuwej.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/pijubelavunedaboxebo.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/45593598078.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/67974853645.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/46667238034.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/57705545410.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/jojuburerakurakebinibutup.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/59328620388.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/32208157332.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/senejuwulawedezupu.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/vubojelusub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+itunes+to+android+mobilePDF 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_off0000ad57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD57 16368 bytes
SHA-256: 54155a48fa8a8209bc840d35c998ff6c2e5ce10221b9cb466c693c86f50f49da
font_01_sfnt_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 10736 bytes
SHA-256: c46471d2574d31eb2683a9d2f197abcf6426512fcf7dafaf701ea593bc410937
font_02_sfnt_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1