Malicious PDF — malware analysis report

Static analysis result for SHA-256 1808187a5843457b…

MALICIOUS

PDF

71.9 KB Created: 2021-09-28 23:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfa0830df398f67d8807e6458fa7792f SHA-1: 03e7f1960c8c43e4851730830e26c615fe2f13dc SHA-256: 1808187a5843457bb968c0ad327c61771e16b0b29b349e11acf07b31cc3381ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious domains, and is described as a link farm. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://firstview.christoff-design.com/files/ronak.pdf In PDF document text
    • https://audreyheselmans.com/_files/file/58852046086.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/lutesibimula.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/69092282001.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/95762849533.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/rukalodetufasapiturij.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16150057acf23f---69179236191.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/sozoxuvugegijovo.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/89906468171.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/suxoxopovabipajimevaduneb.pdfIn PDF document text
    • https://rayvoltbike.tw/geektic/files/dakokagava.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/2742875951.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xowitade.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/viwune.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/lisopuvinigumavedej.pdfIn PDF document text
    • http://feminella.ro/upload/fck/papapemexaw.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/keposewel.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/74093023330.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/33268389850.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/13731344521.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/jinuzimogasefove.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/81280321641.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152fc3392f77---54884538134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=photoshop+tutorials+pdf+2020PDF 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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 17512 bytes
SHA-256: 26415893e13867841d2aae032b63529430055767b3b985237ac73b139e9d2d3d
font_02_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 10700 bytes
SHA-256: 10f58f9003112ca78de69578eadefc1d0817b57e1dd7289afe8bfe1d7e43681b

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