Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea718a11444ceb20…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 08:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f84fdcc78477b7cab804018dc94ce22b SHA-1: d5991cbedf9bee259844ff41879cea9e1d47ef37 SHA-256: ea718a11444ceb2051824c65c96a8d35f6bae7670ba423eadf1cbaf333140ecc
74 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by numerous external URIs and a heuristic identifying the PDF as a link farm on disposable hosting. The presence of a 'download button' heuristic further suggests a lure to download a payload. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 5

  • 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=phone+booster+pro+mod+apk
    • http://runwellconsulting.eu/file/file/fasejakides.pdf
    • http://neoneofytou.com/ckfinder/userfiles/files/vosevoluwinogukamufege.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161304379c4d4a---91914863290.pdf
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/23544591077.pdf
    • http://salt17.com/userfiles/files/mosurosudibalojurime.pdf
    • http://kencert.vn/uploads/image/files/82626226086.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/79937153322.pdf
    • http://st-ark.it/userfiles/files/36521355985.pdf
    • https://phu-komplex.pl/pliki/file/divofeveda.pdf
    • https://b2b-intelligence.it/uploads/file/31817027111.pdf
    • http://www.polni.si/Images/files/wikuporevozaburepej.pdf
    • http://k1a.ru/images/files/file/95600493300.pdf
    • http://amandatravel.com/userfiles/file/6712425417.pdf
    • http://shiokuda1.com/contents/files/sapetago.pdf
    • http://gardensyellowcab.com/admin/images/file/97524868695.pdf
    • http://sobateracota.ro/mm/file/jiferagojebojebam.pdf
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/nejereravadapozesux.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/fawaxitepawivawixurodiwux.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381cf006f0d---disuliwefelup.pdf
    • http://myagreement.com/UserFiles/file/42824797957.pdf
    • http://zopos.zohukum.com/ckfinder/userfiles/files/vetasobopiti.pdf
    • https://nyig.com/files/file/19459397497.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/fukajabe.pdf
    • http://anquocrealty.com/uploads/image/files/85189628189.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/wavirejivokoxe.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_off0000c6a5.bin
4b36663254e032a912c9491680e10c54311f94a6bfaeea2f02ff75ae738e243e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 17700 bytes
font_01_sfnt_off0000f4d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 16792 bytes
font_02_sfnt_off00010ceb.bin
0a54cbef6f9c60311c93d154c2b58cf0b4fdd44ee48b3fbff02e770c737efde8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 10752 bytes

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