Malicious PDF — malware analysis report

Static analysis result for SHA-256 9947c379ad58d768…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 21:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09e668ab7d828de7e396b9ad7ac1923f SHA-1: 305c072458dc08bf08638bcb35e615206b5fb99f SHA-256: 9947c379ad58d768e92e9bc66aeb36ce00f37b65dda4056d889e6e4d40cf55c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classification and ClamAV, strongly suggesting malicious intent. Numerous embedded URLs, including one pointing to a raw IP address, indicate a phishing or credential harvesting attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=psx+psp+roms
    • http://studioesflores.pl/obrazy/file/32393012806.pdf
    • http://transportdiverse.com/uploads/files/fajewimu.pdf
    • https://ms2oke.com/contents/files/lanefimatigire.pdf
    • http://samtekelektrik.com/files/porafutipuminirurisojuri.pdf
    • http://artdental.hu/editor_up/wetegikuwe.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/vodexudumigirofevotakete.pdf
    • http://trovas.com/userimages/xuvavipakuxogugikebi.pdf
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/80655956921.pdf
    • https://carsen.sk/editor_uploads/system/files/32237614851.pdf
    • https://xinpayflow.com/ckfinder/userfiles/files/25356294296.pdf
    • https://bevasilicones.in/userfiles/file/53836821987.pdf
    • http://jiachuankeji.com/upload_fck/file/2021-9-14/20210914083644902385.pdf
    • https://vialivonica.eu/userfiles/files/50370840537.pdf
    • http://kencert.vn/uploads/image/files/vixozo.pdf
    • http://paraglider24.de/pics/fotos/1/file/rituxakesonad.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/18915210991.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/48805661982.pdf
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210909_120917.pdf
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/zifijekerebivigujan.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/12905709182.pdf
    • http://zaiger.ru/img/file/jomili.pdf
    • https://deepex.hu/hirek/files/xuzikogirot.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_off0000d46c.bin
20085dd3d9c826ea92a448d14ddb6aa30f193d4a82a026824a8ea722c4e2acb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 9880 bytes
font_01_sfnt_off0000ea32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 16792 bytes
font_02_sfnt_off00010244.bin
fda102178d20ebc5b12f718f3720e20eac381ae9d0bf35a9aaf0f8abde398f4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 19260 bytes

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