Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bde530446c17bc…

MALICIOUS

PDF

85.7 KB Created: 2021-09-22 13:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f8cb803f61779adfd4b6e3ca2ebbc48 SHA-1: 56b268316f075f7fc561afeda350ef53c1d98a66 SHA-256: d3bde530446c17bce165cd7fb7915e0bed3451957d2ee8a1747a40319ff78f4f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a distribution mechanism for phishing or malware delivery. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://upakuika.com/img/file/padosenebilewuwu.pdf In PDF document text
    • http://zartmobilia.com/userfiles/file/20210909103347.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/lupobevilirotavixuso.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/romewed.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/11020650657.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/gijebanolole.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/rozoka.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/zosilusokinepomakoga.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021092217022491.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/3987361956145712395ce4.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/87095748633.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392120d1690---fipojujabur.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/selabudopanamowokopabi.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/vekiselijuzas.pdfIn PDF document text
    • https://andreivieru.com/ckfinder/userfiles/files/34983112506.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a5fedfdac7901c44167a6dd39a123ee7/15391421137.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/mulovarene.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210922170316.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/34463067519.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/nogudekenifufosewar.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/63354272947.pdfIn PDF document text
    • http://pronobile.de/catalog/file/90092055179.pdfIn PDF document text
    • http://sergeybazarov.ru/file/11922137605.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/favimajavibepotizaka.pdfIn PDF document text
    • http://congtyvima.com/images/Download/sadunalus.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/70661642371.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/64681814167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=twilight+full+movie+with+english+subtitles+watch+onlinePDF 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_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 18652 bytes
SHA-256: b5aa43078442782e306ceb40021fab2770c7344d827a0e00d163bf877bf95622
font_01_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2A 11040 bytes
SHA-256: 0cad459d057b16e981f9c7013255c444f77b62c9402ddde529032586a4c91f2d