Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f18d0ee279df281…

MALICIOUS

PDF

92.1 KB Created: 2021-09-18 11:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e930f84b16c1bb47d8e0214b50eab85 SHA-1: 60ed7e0756cf8cda43e95ea718b2bd50a5056cea SHA-256: 5f18d0ee279df2813e994007cb88a46bd32f603799cf74f40c3d8c0b95ae97b1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing activities. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://inwebjor.ru/uplcv?utm_term=3ds+pokemon+rom+hacks
    • http://innospectrum.eu/hirlevel/file/91910204957.pdf
    • https://akgoz.zemta.com/uploads/files/47618531806.pdf
    • http://kaithompson.com/userfiles/file/jodejolazeditoj.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5da16434---81187324834.pdf
    • http://animationcoach.com/userfiles/file/fibalurasilupatedimu.pdf
    • http://kirakuramen.com/uploads/files/jogupor.pdf
    • http://bidwoodmachine.com/d/files/didepigapupebejusu.pdf
    • https://aarushimukhwas.idealviews.com/userfiles/files/zekex.pdf
    • http://orem.mn/uploads/files/newagezifitix.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4bc63fbb31fb5a2b2776626f713642c6/65579241041.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456070a4d10---giwetugibavibawijoluxejin.pdf
    • http://tt-ural.su/admin/ckfinder/userfiles/files/tifodonemaruzo.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/93087099491.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/xaxazutefigajuj.pdf
    • https://drivetripper.com/userfiles2020/files/jabovaduvakakalanija.pdf
    • https://pima-alarms.net/slicice/file/54895485107.pdf
    • https://georeno.ca/userfiles/files/padizakadup.pdf
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/62217897303.pdf
    • http://stavclearing.ru/upload/files/42567907037.pdf
    • https://soswzgierz.pl/web/uploads/files/82642782066.pdf
    • https://tjp2-hotlink-j3t.com/contents/files/41576880838.pdf
    • http://www.monts.sk/upload_images/file/nijerajipuvatufazolidew.pdf
    • http://ji-tien.com/userfiles/file/muduparidawulamofezodet.pdf
    • http://archive-2014.humandoc.pl/attachments/file/2919242011.pdf
    • https://tcremich.lu/files/files/jatigopogolunaxefepatokok.pdf
    • http://pazzo.jp/js/upload/files/52276002199.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_off0000ffd1.bin
8027f2cbab52c003e5b547b924c6f585e83ceaa7482690c54d02ea7c43638e99
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 19644 bytes
font_01_sfnt_off000132de.bin
9ff1e18aae48081acf75705e6ef2d7763e51a79317d95d09809aead70d7004d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x132DE 10708 bytes
font_02_sfnt_off00014b38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B38 16792 bytes