Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcb6283de4a562c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 00:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 438e126ea1fa738b8f9d66bc2f24a2de SHA-1: fa6cc83c740f131b0157db399009f46f52b1af16 SHA-256: 4dcb6283de4a562c800d63900335d89d4ade7b7cd3430284e557d549d5ee7cb0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=b612+apk+premium PDF link annotation
    • http://redskap.ru/userfiles/file/palivojexitezut.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/84770780278.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c28bde64ba---mawonomalajatoko.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/kajapivozujafamoporeb.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/sotomudukupozuwaligad.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/58446863973.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kijigujewun.pdfIn PDF document text
    • http://caramelitos.sk/files/biruduwixak.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/sofip.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/18297243310.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/49368818655.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/33939103937.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/49712723362.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/65863011002.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/19262424089.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/lowimiromaluxibalumimu.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/81070906541.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/vuzajaveriwinuvuwuta.pdfIn PDF document text
    • http://olympusflights.com/files/files/4221551690.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/fomuji.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/vubivoxozomunexegefer.pdfIn PDF document text
    • https://fond.ru/userfiles/file/37390906582.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/64112128925.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/93599399596.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/pr8i72ngl7km7590ub3p9k3pq2/12298547897.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/tewajuzuxafakareke.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/vijikomusumiti.pdfIn PDF document text
    • 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_off0000b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 10464 bytes
SHA-256: e75ff0c516a71ed222dc136e07b618bbb7f506c5d47328c7cb73b06a0c310c66
font_01_sfnt_off0000ce77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 15308 bytes
SHA-256: 04859280fb6fbca258550a3e51dac4f48c9859be461cc04d0dd5b800c678325f
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1