Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f886540783f4ef…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 17:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2cb3cf36d2783574943b1810b1efbeb1 SHA-1: 529f5a948d3f1cd2c8d17abd54027cf375dcbce7 SHA-256: 70f886540783f4ef13332db78f1c07c793b8c85e97dc0e0b298edcbb3f90db61
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the presence of numerous external URIs, including a link farm on disposable hosting, suggest the document is designed to redirect users to potentially harmful websites. The primary attack pattern involves using the document as a lure to drive traffic to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://futboltotal.net/images/files/tebibidane.pdf In PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/62675726343.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/77b618cb77d45919cfec8ed692a878f9/84980604304.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86189312697.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/sadafejosese.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/wovenelamefimivifobefe.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/94926346612.pdfIn PDF document text
    • https://alohasafaris.com/files/86267239253.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/33549056357.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ef716400---xewedinomuvegupegek.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/89620638246.pdfIn PDF document text
    • http://szwygs.com/upload/sarafimo.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631387502.pdfIn PDF document text
    • http://ebus.cn/up_file/file/rokazaxezarive.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/87881269269.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/dajib.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/rugunupare.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/wizaxizubepuwetodatoge.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/vitekolelamafuj.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/55006109256.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/14532058929.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/24806106158.pdfIn PDF document text
    • http://gerocuki.hu/user/file/wapasejupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=rbx+legends+robuxPDF 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_off0000d288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD288 17688 bytes
SHA-256: afc358c6958593b9abd436d3603949f1e26ea588add970e3c012cf4ba77a772e
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 10460 bytes
SHA-256: c7310fbdeb19bdce9ebc7e57dc1bd502eff752175166e863d834b4593fd20b4b