Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa934b5c8af32bba…

MALICIOUS

PDF

76.2 KB Created: 2021-09-14 21:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b35af7132843da5610bde9ecfa781f9 SHA-1: 203e84b621bf58c00eb039be1333ffbf4c07bb42 SHA-256: fa934b5c8af32bba4e346d3d7fcee5a24bd858dcf34cddbb5dcb409f8d369140
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, suggesting a link farm used for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing users to open a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://gabident.pl/local/userfiles/file/60728046186.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350c11a22ec---19798047712.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/48590497543.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/49112919903.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/67779841285.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/dofifigukogudija.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/64797809218.pdfIn PDF document text
    • http://sieuthibds.net/images/files/95933671828.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/66718504927.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/kiboburebakamosopijow.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/punibizatadugirepusoja.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/bunijaxuzimobejoje.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/lapogadezazemowugu.pdfIn PDF document text
    • http://geasit.it/userfiles/files/51502147876.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/58624924083.pdfIn PDF document text
    • http://mobiliteit.nu/files/9019337617.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/lugojewizabofowe.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109041318412284.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/97309498373d78064f04e6f1a6777426/57613695077.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/22660374995.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/xifibiriferogab.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/bijotuvelikifubiripixefab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=como+ocultar+carpeta+de+fotos+en+androidPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/55605522924.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_off0000c58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 17600 bytes
SHA-256: 8a2f9daa9b05a023cdba6ddf7d62036d19d37d64843815d1a52fb982fd9bc98d
font_02_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 10912 bytes
SHA-256: 13fe75a8d61b3deef02ef4e9be642060494d3fa1855cda6c6633c48fbcc2390e