Malicious PDF — malware analysis report

Static analysis result for SHA-256 495947b6a8126e12…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 10:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d14c5ad461b2886db21b0a6ac5a56846 SHA-1: 1956892f93f74a5ba99ff3c3df968088b144b6a6 SHA-256: 495947b6a8126e129e233e68ac405623d234a56698a9cbcd68ae397fae4dde06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a probable phishing or malware distribution scheme. The presence of external URIs and the nature of the embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://cructi.ru/uplcv?utm_term=pd+proxy+download+for+android PDF link annotation
    • http://curvesncontours.com/userfiles/file/96817374549.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/sokakilasowu.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/pikifizexamajubusuv.pdfIn PDF document text
    • http://houselandia.ru/files/10801981603.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/wesedosuk.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/66679150644.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/81749837455.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/dufupokifovinojabodaru.pdfIn PDF document text
    • http://nature-revive.org/files/file/77988201972.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zafugobafibufi.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/18990470133.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/15218760833.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/87019549470.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf32167e2---38828658830.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/95935049949.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/76316200873.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/13487114913.pdfIn PDF document text
    • http://handgun.ee/media/file/babovotuzeva.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/18039071927.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161424e3a430b2---mesapetem.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/13013247871.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/13622833635.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/jigis.pdfIn PDF document text
    • 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_off0000c41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41E 10396 bytes
SHA-256: 8a7689d5cfe7a5354a6463def26bd2ba9809755baa0cbd3d3baa74d81dac4720
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 16748 bytes
SHA-256: 903393de8c0b3507b1e5d27bfb1e103d547ed0f45a576086888c72d762615a1b

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