Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b01680df7d1bb5…

MALICIOUS

PDF

90.3 KB Created: 2021-09-18 21:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0b0a0c3e4e00a148a873427411e4ec7 SHA-1: b8e4f9ed7ad888b57129400f6ca1bdba35dc9cf5 SHA-256: 82b01680df7d1bb5b0bc29c3478e74e5660956ecbf8e041a85b0e79e7616feb3
134 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 ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as evidenced by the numerous external URIs found, which are often used for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=fortnite+cheats+ps4+2020 PDF link annotation
    • https://speedwayinfo.hu/uploads/file/bivukobalexav.pdfIn PDF document text
    • http://geotersrl.it/file/75757681675.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/35654401983.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/dumobi.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/gadekelu.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/zuvanadisijale.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/58839900250.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210914115555.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/77119495099.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/niruko.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/19800471225.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/laxepavoju.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/laloravewowirijamoti.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/80385570479.pdfIn PDF document text
    • http://goldia.cz/data/file/90001943084.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/bebeno.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/piwimurenumomiwesev.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613947d2d8ed4---sagoduxumosawenivu.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/xopapoboligepokazivedit.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/8450381115.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/zitubeda.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/mixidobufog.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/kimopiwulalilosumisedezo.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_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10720 bytes
SHA-256: 18467ce8b336235eff7f4494135ea640a5f54f1f0ca24c9233aa85aa4d24b5b8
font_01_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 19216 bytes
SHA-256: 26cebcb8e71700149ca654ce25fa8225a3d0b61b7160fc99c50d1dd37b26de2a

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