Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dbe79351027949…

MALICIOUS

PDF

77.5 KB Created: 2021-09-21 02:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d7915fa94eb12a963699acb651de83e SHA-1: fc28ae0b308e0dfb64892d9700b040a9212ce733 SHA-256: 91dbe79351027949f54b87238997985f56ebed2f3581b5de943be87777083307
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 distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=free+sex+games+apk PDF link annotation
    • https://value.ae/userfiles/file/71421042964.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/damurulusomer.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/21261724073.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109120752284612.pdfIn PDF document text
    • http://355353.ru/userfiles/file/zigetufutowatozidu.pdfIn PDF document text
    • http://usmleworkout.com/files/file/97437881163.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/40456609289.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/zutabijavodun.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/ferekatedenos.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfbdd81a65---67900939485.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/renizaderaxubedoworowowu.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/guxaw.pdfIn PDF document text
    • https://simbotour.ro/ckfinder/userfiles/files/80966762221.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/vubopu.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/kidevurafoxu.pdfIn PDF document text
    • http://geodez.com/pliki/file/48171603251.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/9498868576.pdfIn PDF document text
    • https://chptravel.ir/data/file/mufuzubizawa.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/vefolawugukakeperalof.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/koziwuvuzevuxifukad.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/32315567167.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/javadalofotasuto.pdfIn PDF document text
    • http://esejsc.com/upload/files/56489588310.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/31603726130.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/71562588388.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_off0000cb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB78 17928 bytes
SHA-256: 53882a8c835c0dc61b2d516a862428d8a9fa9b7bf61e299aa4514e0a77b4561f
font_01_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 10308 bytes
SHA-256: c336066c9ef76985a75a2567107f9c8c3bda457baca12daf6497fd050b3dbd19
font_02_sfnt_off0001106f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.