Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dc3e39d483f75c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 13:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: baf67cd87924846d0c929bdf954fc954 SHA-1: 90fc5a1598abb37d1a10ee9fd2d875eaf855b22d SHA-256: 67dc3e39d483f75c275dedeacbf622afdd81378b798b18c9add932ea6747327e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=how+to+find+my+hotspot+password PDF link annotation
    • http://healthywithhart.com/res/file/88975297067.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/watofuzawitepa.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/58135793994.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/79868225444.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109062049501106.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/tubogawazazow.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lozudodalesozemaze.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/dipunorurobuze.pdfIn PDF document text
    • http://dongphat.net/upload/files/kubafevobogokol.pdfIn PDF document text
    • http://drironcat.com/images/file/1316969408.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/94871781193.pdfIn PDF document text
    • http://planetamama.ru/files/file/fariromawuvulexamadesit.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/foguxupigixadas.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613394e4449ef---57362198718.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/84704267967.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/rozimegolokakuleredipuru.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/gisupijewedisugola.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/kulumivo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/peronununalogijeze.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/93231789798.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/mivalewijamawowezuvop.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/96451532281.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d48db006---vakulugonizasitaki.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/kulakemoxugoduvuka.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_off0000be76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE76 10776 bytes
SHA-256: 49820d9379a0db59dc18f425413ebcd01b55dc2644b3d4e6ffc7a40ee8726d0d
font_01_sfnt_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 18268 bytes
SHA-256: f6a9cccab9d2d213c606b08381ce0a888d90e0ff88148311e09ac903c1a00515
font_02_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1