Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a731bd8906aa80…

MALICIOUS

PDF

72.4 KB Created: 2021-09-13 22:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 396ac595a924b4056f7a3e8bce285d67 SHA-1: c6a2f426e78a1c1b589af8df3ab01bd7f6b6502e SHA-256: f7a731bd8906aa808a040ef95d5fad5630bf6af719850b0aa5f8681d8350119e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://pcserviszlin.cz/ckfinder/userfiles/files/romemajoripigevuzusemefo.pdf In PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/gaxiwovosopunimami.pdfIn PDF document text
    • http://www.andreapondika.cz/file/kufukubenozepivigu.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/400284749.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/diporofozeku.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/39846337419.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/66363684757.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613646d52d086---92658071443.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/woxuranakozuzad.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/67348226665.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/fivodipafojomepuf.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381a9dafeb7---vifibusanerusozaro.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/vekidenob.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/30653887106.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210913131646825790.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/45495478002.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/28107173156.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/76464152304.pdfIn PDF document text
    • http://stylekd.ru/files/dimasorapavise.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/pizoxezajulejebab.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/jabipibo.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/gomefelu.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210910171824.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/tekopepenujizejuwobevem.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/2869478541.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/sorurefibafisotab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rurouni+kenshin+full+movie+englishPDF 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_off0000b626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB626 10704 bytes
SHA-256: 1534c53fae66ea9eda2cb73510c1ea93a24b42134fd12ee2318b031231c74eba
font_01_sfnt_off0000ce86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 17288 bytes
SHA-256: 5ee840d41a46f57217540b1518578e5e159e785d74e9c0f71b7be3238aa5c486
font_02_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1