Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7c7cb62b43afc2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 15:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d068f7fdeb8e5ed72698c86a9fcc3f2 SHA-1: 3a8fc706beffb87c0ae15a899deab2d1d4305661 SHA-256: 0d7c7cb62b43afc27d7f7d649a7d2f7e3a0c575a504edc94ac4dbdda85645c43
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aloisiquadri.it/userfiles/files/kevozefok.pdf In PDF document text
    • https://thehouseproduction.net/file/64208195272.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/21462675543.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/zipexoberi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/ratofijopijavajaxotijatej.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/88763537520.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/bawowiwufuvadufonuserosaw.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/bezodebipixazilibeke.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/zonibumetebimivuwulamulik.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/nenigedakim.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/junix.pdfIn PDF document text
    • https://maviet.vn/upload/files/11328983007.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/5326758469.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091416511143.pdfIn PDF document text
    • http://zgic.ru/!upload/files/43822426494.pdfIn PDF document text
    • https://ksboutlet.com/file/files/kazisumuxudetanove.pdfIn PDF document text
    • http://topstec.com/d/files/wifotolorupimikanozut.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/jajozufigalomilipi.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/9562815998.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16135997d92465---weluzizinikabuwexezunun.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/80498734714.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e7dc8dab9---82267633299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jenis+font+terbaik+untuk+androidPDF 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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 10624 bytes
SHA-256: 522f1c676071f7c0a9cd01988f79b56d12e91f4ecf5aa8ef183387dca03067f2
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 16628 bytes
SHA-256: 63587058ffdf03dbe6b90b58ddf6aa55f092009dc328ad5a3ee711d81b8360b4
font_02_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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