Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca520d26909f5f96…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 14:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e025c86739db9358dbf7f8a7b3f0352 SHA-1: 1927d2dc02139956f906024888620771a90f0d5c SHA-256: ca520d26909f5f9609b188bb91ada8858e85d909a066b2f880a8d9ae9f6ba13a
166 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic specifically identifies the document's content as a classic advance-fee fraud, attempting to trick users with promises of prizes or parcels. The numerous embedded URLs, many pointing to PDF files on various domains, suggest a link farm or distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://imaggu.com/ci/userfiles/files/97545244041.pdf
    • https://loyallcanada.ca/editor_files/file/42644362508.pdf
    • https://tekstilkentrehber.com/upload/ckfinder/files/repezibeki.pdf
    • https://univerosg.com/ckfinder/userfiles/files/gozadaxuziboviwuvidex.pdf
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/52766140833.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3dfc24355---60034735249.pdf
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/ziwikuvopekerano.pdf
    • https://keongracun.org/contents/files/mufodejukomodan.pdf
    • https://mintowncoffee.net/uploads/images/files/kumofasuj.pdf
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_125246.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/88274976668.pdf
    • http://damnoen.com/ckfinder/pho/files/fonewefovisegidababeda.pdf
    • http://dietgame.net/admin/fckeditor/data/file/20210908130753.pdf
    • https://wronba.pl/uploads/wysiwyg/file/joxawivepu.pdf
    • http://dreamsurgerycn.com/ckupload/files/tugejutegaz.pdf
    • http://christopherspubandgrille.com/userfiles/files/kimapup.pdf
    • https://8cj2aja7-8mxb.com/contents/files/mitakigexo.pdf
    • https://aventura-agence.lu/userfiles/files/31241401172.pdf
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/kapenena.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/dakilipu.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/nezirowazip.pdf
    • http://davcpundri.com/css/file/sewuzelezegu.pdf
    • http://metalzilemboeventi.com/userfiles/files/48743197372.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210911_95BFF28FC80A107A.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=vidmate+4.4318+download
    • 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_off0000d942.bin
ec47787f4c69c006afe521bb9e28e39a6735bd5e89bb5cc2cc2d9f3028b30924		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 10772 bytes
font_01_sfnt_off0000f225.bin
a609403cce528e8b051409c4335001472dac9f8128b7bfb0622bd08f544d73a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 17660 bytes
font_02_sfnt_off0001204f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 16792 bytes

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