Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc6a09c3303933d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 23:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de6fc19f0be7a86f54d7cbe084c3aded SHA-1: 6b2aa72b487358ea2dc8013d9828860b369afd86 SHA-256: cdc6a09c3303933d13f3b1e508ed430a38216977e0785f765857d30b25ad5280
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. It contains a large number of embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to host malicious content or facilitate phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious destination through numerous redirects and link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://dentalweek.eu/userfiles/files/rugatalamenolaxi.pdf In PDF document text
    • http://melabo.com/upload/files/89792766295.pdfIn PDF document text
    • http://mc-opony.pl/files/file/39357408290.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109131925379826.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/gasifib.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c410abcf9---77139053636.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/23786997302.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/pobuxuniraw.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/43875984453.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/53663063085.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/92641901820.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/nuvofipezekujotatimekavi.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/10104760740.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/sunujemaxujevologes.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/18521009707.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/runesoja.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/zeporufetupubaposoje.pdfIn PDF document text
    • https://el-tall.pl/pics/file/rodorupufovozomifikona.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/masalale.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/zowofegidatopoxofenowul.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/lasogifufuk.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161302c7001e1b---wizekajikebewugojon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+student+of+the+year+online+with+english+subtitlesPDF 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_off0000dacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 16384 bytes
SHA-256: 12eca70ccc2fcade937af20ba0d4e2f555a6856f21ddbbd3dc9f16474bd0b569
font_02_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 11188 bytes
SHA-256: 4a426b973e15f959e494e1c6e78639c5818c1574b5c388f5098a20d2a3e6ccc2

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