Malicious PDF — malware analysis report

Static analysis result for SHA-256 52019088abd1ae01…

MALICIOUS

PDF

88.7 KB Created: 2021-09-14 22:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6951fe4194805fed4626fca2106e27b0 SHA-1: 55fcba68efa89416910350319d26df23c4ffa784 SHA-256: 52019088abd1ae01a19bdae67a0ed2c267abd6b4755abb94823d8e66e8e69cba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely responsible for redirecting the user to one of the numerous malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=applicazioni+android+per+fare+foto PDF link annotation
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0de8a47eb6d70545d5791cc03d86ec92/34406123888.pdfIn PDF document text
    • http://synphabase.ch/upload/file/kanokatanoxaledi.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/ruzamesuzarix.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/vulimuxufivokigurupeje.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/96748849064.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/waxixozusokevimiwu.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/35977859606.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/8450364304.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/68946992965.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/10330950434.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/83280894159.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/denedesagoxesovefuva.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/purulufidipodidarif.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/24873119664.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/51507793301.pdfIn PDF document text
    • http://odumakus.com/uploads/files/84528902618.pdfIn PDF document text
    • https://synersys.fr/contenu/file/75196472975.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210913062357.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/41480033919.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/90761674258.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/22160327252.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/15110840541.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/79992316712.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/3188106673.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/90670909688.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161407ea4e03d6---meniru.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 10488 bytes
SHA-256: 5dde3b5587a6e9df132ba7314c684c1a4591ea543cf815cbd97268b6d483dd4a
font_01_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 17804 bytes
SHA-256: 1d19c1c8f894b77bdcbf5f667712d85dab55d66cac3b218d6e4386cccf8e68db
font_02_sfnt_off00013cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1