Malicious PDF — malware analysis report

Static analysis result for SHA-256 836a5cc53c631d1d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 02:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f90fd5d91a203aa14ecfe619b97615c SHA-1: 10f959b11f84d3a4654eb3b63f8b777c17179ef2 SHA-256: 836a5cc53c631d1df51db80c5431ec59ddfedd76274a7b8fb30fa8205843052a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to host malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://supermarketdv.ru/files/file/luzinijejidagaliji.pdf In PDF document text
    • http://nissanotogovap.vn/uploads/images/files/40388595533.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/90328427405.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/ad9aecbd4366774e62db90457465ea8b/14197524693.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/xeparunepomu.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/25727758514.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/jevaserifobopipiwowimaxas.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/38353556219.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/nubexabur.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/32746685293.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/wusiwefejenetab.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/rowatirosopol.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/bezokuwugebosebapefakol.pdfIn PDF document text
    • http://newo.ru/files/files/fukawuwojuzaraxos.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/fosifefoxosabuwakaxum.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/77597258751.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/88071187551.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/zagolajipukaveza.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/xewifatof.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/62227949665.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161313ce629d24---mudisewuguvewubemisiw.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/dogovipavosuloxome.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/jutarodonusuzubowoxudez.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/towimotebixixetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pubg+india+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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 10220 bytes
SHA-256: 1d2abbcaf63d3a206bc6db113573b45a40fe89f20f5c55857cb8229fcbcac1bc
font_02_sfnt_off000119af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 17000 bytes
SHA-256: 8e5920fda2e0cb09f0515e2b8ad7c19cbdda74bcf005da670c79b7fe7223154b