Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b55b533404b6d46…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 15:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 409307285d994b4b353fd5769e0805fd SHA-1: fd557747687cd2727687676fa51da4664a5b3b01 SHA-256: 9b55b533404b6d4648e66c5be2f2c486534d618928ce666c2d8e0129e1917b12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=running+to+you+mp3+download
    • http://suvagcentr.ru/userfiles/files/viwaxerenivokavepusizipak.pdf
    • https://marblo.marblobaths.ph/app/webroot/img/files/pofenibibomobogom.pdf
    • http://archidaldegan.eu/userfiles/files/tibegesuvuvoxazimigibax.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b9d22dfd---44654339347.pdf
    • https://manenshop.com/upload/files/16657276198.pdf
    • http://ewtch.com/upload/files/dodajudemigolik.pdf
    • http://pomelieagency.com/userfiles/files/83951467381.pdf
    • http://homeloanz.net/images/e/file/xegomaposuworakinab.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/37427675812.pdf
    • https://internationalmedia.com/userfiles/file/69686687218.pdf
    • http://phuocthuan.vn/images/pic/file/96960168689.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/27968034884.pdf
    • http://pradakshinam.com/fck_uploads/file/52876842166.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a95158edc5a973e20cd244c0cee8bf5a/situjosewuvaxog.pdf
    • http://aromaonly1.com/yamituki-n/uploads/files/dajeweta.pdf
    • https://ywint.com/ckfinder/userfiles/files/1631869574.pdf
    • http://pedraferro.com/files/files/vekigovux.pdf
    • https://noelex22.org/userfiles/file/wogabu.pdf
    • http://www.leposeur.fr/site/upload/ckfinder/files/tupag.pdf
    • http://neonatal-surgery.ru/userfiles/files/30950961336.pdf
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/67369680361.pdf
    • https://tidurmalam2.com/contents/files/bobetapujokimanufebup.pdf
    • http://marthomaiticherukole.com/userfiles/file/tejatogiwuxemulotak.pdf
    • http://jolanyee.com/upload/files/202109120154245671.pdf
    • http://www.mustwalge.ee/data/content/files/54228637357.pdf
    • http://mirutte.com/newsfiles/files/2326321927.pdf
    • https://incense888.com/uploads/files/202109091511114308.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_off0000dda5.bin
0b07c9ef0ea5b86e756cfd0ada5ade5bab4319ddb83e988acac74975788416ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 16788 bytes
font_01_sfnt_off0001091c.bin
abed522f7cb5650e5f62ead659da4b24e2c3f718dedd7684de80981e6afb0ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 10852 bytes
font_02_sfnt_off00012203.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 16792 bytes

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