Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7ffbcef75fbf34…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 12:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec02717a7e74c045286b40fd26df7346 SHA-1: 5a0b7bba2bfb853002b66d63581d4db46d60a9fd SHA-256: 9a7ffbcef75fbf34459ea699d40439fa575fa64b33b5c7403e35d2fcf98e41a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to lure users to malicious sites. The file's structure and the presence of many external links indicate it is designed to redirect users, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=watch+true+detective+123movies PDF link annotation
    • http://www.gieskestukadoors.nl/ckfinder/files/files/95338940408.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/molazufupow.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/45302298318.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/76183487663.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/mofazavigapuve.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/nugaxo.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vudutamijuvakikize.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/bofetof.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/96235653390.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/zodudalojofarovakek.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/38272198011.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/widajuxute.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/10800465707.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2e01b0f7---86169505992.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/62930096391.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/sunulew.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/zikerokagefinavupuzas.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/ditilubegozekaj.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/fomoxuderabekikezipewod.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/66936262516.pdfIn PDF document text
    • http://ilkemymm.com/image/files/gizagegudigetupojaxudoreb.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210907_17472B018464C57C.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fc465a4172b22c9f9dc0e79303f1c7f8/99074008965.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/xarutuvit.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/37437583645.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_off0000c6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 17268 bytes
SHA-256: 847a3cf64e42d06a1ea9967510f8987cb55f43d8c0a93d655805d6a5a166c70f
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10988 bytes
SHA-256: d8e38075af68f1f839f4bcb1c3e366e9b249a33ac029ff1eeeafbe3db43ac5d7
font_02_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1