Malicious PDF — malware analysis report

Static analysis result for SHA-256 82930823610cef4f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-10 13:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f60cd54002b4e08a8d24a64b3d28a3c SHA-1: 39cb09731c38182dcf12791ca601c4440c1e0d44 SHA-256: 82930823610cef4f9a2be8aa9a82fc186cae618c34df16b4cb5673b92afc0163
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are commonly used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bakwanudang.com/contents/files/54268467444.pdf In PDF document text
    • http://pazzo.jp/js/upload/files/33834378764.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zafajowerumejar.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/rufixukewi.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/juxufutowinedimamano.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wisositikunepeg.pdfIn PDF document text
    • https://limadelimon.com/images/file/35051602677.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/40239472949.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/fifawasarive.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/wifurijetumij.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/57105135870.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/vovapikekide.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/46658330734.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/luvajitiligi.pdfIn PDF document text
    • http://texmet.pl/userimages/file/fakizanoxemajejo.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/fififip.pdfIn PDF document text
    • http://esistore.com/userfiles/file/45343277496.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d9431408---76359943082.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/voxenudobajasiwebenaxeri.pdfIn PDF document text
    • http://koala-al.com/d/files/wovavelagenebil.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/bedakezugewufokes.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/dulafaminujunita.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/mepatibugimusaxezewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+computer+visionPDF link annotation
    • 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_off0000b1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 10616 bytes
SHA-256: 01dd3d8ec73a34a02494edf302d09b72dc326b6907d9310c9adf6482427f6efd
font_02_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 15336 bytes
SHA-256: f4314ac0879c5dd85fa9293ce7a5b0b86235d07314339ffce8ce360614a21c7e

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