Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74efd11e70d2376…

MALICIOUS

PDF

85.3 KB Created: 2021-09-10 18:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f917d07dcde8cfd7507ed74a56ca4bcb SHA-1: 225328011ad00ef0bc0ead1b2a7e807daf55af90 SHA-256: f74efd11e70d23761a0c927b8936a6451ba74694a2c0f5174dd9f2787069f07c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and numerous external links, many of which point to other PDF files. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading further content. The embedded JavaScript is likely used to facilitate the download or exploit process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=hex+to+float+converter+online
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/13146572365.pdf
    • https://aldapa.eus/files/galeria/files/76755739474.pdf
    • https://museuminiaturesbesalu.com/files/53363129711.pdf
    • http://idcla.net/upload/files/43122232297.pdf
    • http://drumlockingclamp.com/FCK_Editor_Images/files/38890471280.pdf
    • http://rayanchem.com/d/files/6196390335.pdf
    • http://xn--49st2et51duvk.com/upload/files/35018733529.pdf
    • https://dp-silver.com/userfiles/file/visebelagebudoridajibo.pdf
    • http://www.salac.cz/ckfinder/userfiles/files/21869764161.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/60325589565.pdf
    • https://afgventuregroup.com/cfiles/file/16166670656.pdf
    • http://anindecor.pl/files/file/27060181156.pdf
    • https://osikovo.eu/webroot/img/content/files/23824436090.pdf
    • http://karinameal.ru/imgdish/files/21112556705.pdf
    • http://rsport.eu/yonexshop/static/file/38169854648.pdf
    • http://kasargod.net/uploads/file/56574438480.pdf
    • http://cpgny.com/userfiles/files/61904892578.pdf
    • https://indobaliart.com/sitefiles/file/30091481282.pdf
    • http://keralabiblesociety.com/fck_uploads/file/24218404867.pdf
    • https://zlato-eu.cz/upload/files/menozewokepuselagufukez.pdf
    • http://dkstores.gr/userfiles/file/79418224292.pdf
    • http://www.prieteniitehnicii.ro/documente/file/493599045.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed69fb4de4---loragidopiwifisi.pdf
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/visisixumexefu.pdf
    • http://www.puhito.hu/uploads/38841915065.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_off0000e765.bin
35c1e3c5345f691d06a6b5288068c33f653ba0571f5925b4818bc9fe2676ec81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 10320 bytes
font_01_sfnt_off0000fec5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 16792 bytes
font_02_sfnt_off000116d7.bin
87f2bc9bfed7040c7f262c8b4d92219f19230961ad9495adf232fcf1855122d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 18452 bytes

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