Malicious PDF — malware analysis report

Static analysis result for SHA-256 520ab01dc4046393…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 13:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6713f20d75816d6ebe7a6b72d7242e9e SHA-1: 67d0bba7d891806c5ecc207dfa05b80ca210dcf6 SHA-256: 520ab01dc40463937fba47e5a874581ba58ac1df960bd7afd8cbf21380b84da9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains. Heuristics indicate it functions as a link farm and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded JavaScript and external links suggests an attempt to download or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=my+hero+academia+movie+watch+online PDF link annotation
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/89366828628.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210904230702.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/13348271280.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/gutuwesilajodokuworesurez.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/13920702905.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/mebigen.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/92285788448.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/66844681197.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/48225024296.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/pexano.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613104cc9105f---wirolataxamumimefowisefol.pdfIn PDF document text
    • https://buyafranchise.org/files/files/74730007016.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/zolagulefuwe.pdfIn PDF document text
    • http://anindecor.pl/files/file/15557788778.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/73709336846.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/datarodonazusaxiduwimilir.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee666df8f7---tukaxamuj.pdfIn PDF document text
    • http://mylodge-naoshima.com/dutidijoxotodefofuzofi.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/2613936193.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/jejilotuduvonuxufovobe.pdfIn PDF document text
    • http://ipllaser.in/uploads/73735143978.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/jebanemezep.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/9921284756.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/manawitufizawutimama.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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 10728 bytes
SHA-256: 3a5ef1387ecddc827b2861b3049e92480f3ba1f92c3e78adeda53e49c4d516ab
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 18088 bytes
SHA-256: 8b6415d4e3bc7f439165e9d4225ea9b4f91ff09ee8b663bbbafc140d7aaf97ab