Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd62be4eef87e22…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 08:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6fd294efc9c7574e8ed9c9ebdc4d3cfd SHA-1: bb7183f098cd1e8d04b054f34151c42a62eab8b8 SHA-256: 1cd62be4eef87e2215d3dc05f8e758d951d49377aba1566b3d7c3dfb76b8327e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains numerous external URIs, with one identified as a link farm on disposable hosting, suggesting an attempt to obscure the true destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://generoussecurity.com/uploads/fumilo.pdf In PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/28039832473.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210914061546957.pdfIn PDF document text
    • http://domario.ru/userfiles/file/88326531543.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vekagunanokamomevixemu.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/lidilipi.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/30197459505.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/pefidadeneka.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/42819614566.pdfIn PDF document text
    • http://friulanapanini.com/images/file/9612243274.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nadukobemagiri.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/5576758327.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/gevewomazulasa.pdfIn PDF document text
    • http://xhzhengli.com/upload/12485958611.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/baposezuwekepirofuzemeb.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130841688b36---xiwugowefe.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/vofugixomebidarowi.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/benoze.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/34355456544.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/6123517777.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14312274726.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3722d71d120ad108d6cd2d0985f0628d/wamupizatudutusifip.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xizosokitimemitunanad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ultimate+ninja+storm+4+free+download+for+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_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 17756 bytes
SHA-256: 62b4061a4a5b41bdc11de808770f10d431959bcfcdcbfb0b76041f34d31467ef
font_02_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 10816 bytes
SHA-256: 002b6478652f2e4fe13fd1ab695903e74f2647d5683d023fa60b23221fc19444