Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6b73ff051e24a9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 12:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 200e5f72bc4432f25cf5795b596928fa SHA-1: 302b029ea240b584addd8b59724919aa4aa977a1 SHA-256: 1a6b73ff051e24a9b3862662bb6872df2937ca4df5107cc849d07eea77fa1d04
174 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and is flagged as an advance-fee scam lure, suggesting it aims to trick users into paying fees for non-existent prizes or parcels. The document body is heavily obfuscated, but the heuristics strongly indicate a phishing and fraud attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/gakaduvuzomufofuputefux.pdf
    • http://tuzy.pl/Upload/file/satogutotinaw.pdf
    • http://upakuika.com/img/file/rigazaparedoluf.pdf
    • http://firmen-bekleidung.at/userfiles/file/darajujuxugovi.pdf
    • http://studiotecnicoforace.eu/userfiles/files/telemamuruzekidisumefibon.pdf
    • http://southerncross-ex.com/images/blog/file/bomimuregifadituvubejeriv.pdf
    • http://bilmatbasim.com/userfiles/file/6633994893.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa31a14f7---fuxotuvuzediko.pdf
    • https://theipbuzz.com/images/file/vidavikewobiwusatuf.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/dudikurad.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/49352535017.pdf
    • http://salt17.com/userfiles/files/vefiz.pdf
    • http://sahrugs.com/userfiles/file/jodadevizugusadigama.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/80571185341.pdf
    • http://maturitni-ples.eu/UserFiles/File/joguwida.pdf
    • https://n-tlg.com/files/file/15816231170.pdf
    • http://trustarshida.co/cache/fck_files/file/gojusixodegivu.pdf
    • https://avigailpekelman.com/sites/default/files/file/35680757215.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/medelimezubexigelifefipu.pdf
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/rawufosonosagaba.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8ba86f2300a1fda661872fefb76e53ae/doxumijuxito.pdf
    • http://mtreurope.com/ckfinder/userfiles/files/55220975796.pdf
    • http://saraiaser.nl/userfiles/file/nepewidefurifu.pdf
    • https://zlatartopalovic.rs/files/mizuloxonojewo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=zynga+slots+android
    • 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_off0000df1c.bin
75bb18438de014ac9216c7b9b47978d2e225c899aee78e078abadc692ef002fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 19312 bytes
font_01_sfnt_off00011117.bin
e03cfbe72ae5e5d8e0aae1316ba67c3df1a72cdd93df68920cbf00172761ffeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 10368 bytes
font_02_sfnt_off00012878.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 16792 bytes

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