Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d997af317e94ff…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 14:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb75f529a93602d902b862764c256918 SHA-1: c56eff6255e89ceb67325497aa4a84817f04543f SHA-256: 40d997af317e94ff7f13b8e94d2b6e63d8cb4246cdd8fc3d9bd8688c87a82900
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to disposable domains, indicating a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=thoptv+app+pc+download
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/wujefununekigosiw.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/xitor.pdf
    • https://zivotzaokny.eu/res/file/nomidotopifux.pdf
    • https://cyberbirddog.com/userfiles/files/ximazuwedefetexavaz.pdf
    • http://metrominicabs.com/survey/userfiles/files/vifom.pdf
    • http://gnox.vn/upload/files/jimadedifez.pdf
    • http://rayer.cn/d/files/vujisometolanolimewaji.pdf
    • http://hodoan.net/userfiles/file/29979388276.pdf
    • http://tongshengchem.com/ckfinder/userfiles/files/suzugixosi.pdf
    • https://jamisonfurnace.ca/userfiles/files/50402650881.pdf
    • https://clifestyle.net/uploades/userfiles/file/40525715039.pdf
    • http://jhdljz.com/userfiles/file/1630548942.pdf
    • https://fuoriscena.eu/file/83069587211.pdf
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/gasatisi.pdf
    • http://casaperugia.fr/userfiles/file/98285661330.pdf
    • http://xtra360.net/campannas/file/murewijolepe.pdf
    • https://southwestlooms.com/admin/userfiles/files/rolurefexalogize.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/femumalolegiwogo.pdf
    • https://leciv.fr/uploads/FCK_files/file/55772444451.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb1827fdd---80994051868.pdf
    • http://alvitraders.com/files/25882743895.pdf
    • http://amadpich.com/userfiles/file/wufitemapo.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82373055374.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/muwuruko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd11.bin
bb066f43df4dcf0f8b6a3bd711be0882ed70fcfd713278d8461e323581feb695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD11 10236 bytes
font_01_sfnt_off0000e40b.bin
7b847210bbab7c688642d60be2075f05301f794dc2b9cc6b49d1ae54f6c7e5a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 17324 bytes
font_02_sfnt_off0001106d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 16792 bytes

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