Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd207257549b773d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 12:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbb292dd93bbe71bcfd39d7d80b6dfdd SHA-1: 0921d5d28aa3bb35596d3720607e9c3f0f25220b SHA-256: bd207257549b773dbc7c203707db78293dcf7fe48df028575b9bb6fe4cf008b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=wallpaper+one+piece+android PDF link annotation
    • http://vitanova-cattery.com/upload/file/vurepokomoxez.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/totonanewudafikekivizumiz.pdfIn PDF document text
    • http://scarpatti.com/files/7184662608.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/21974421740.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/puvelujapimox.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/96598779439.pdfIn PDF document text
    • https://stotex.rs/files/jufoxurojinukizo.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/burakekowarelosemiv.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/zosidozolokepaxobivogo.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/85963640728.pdfIn PDF document text
    • http://hidramaco.com/files/files/42361933889.pdfIn PDF document text
    • http://bienenaktuell.com/sites/bienenaktuell.com/files/file/godekolojegopates.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/82897510926.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/ropobatapiwezapokesavib.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/xusokarenu.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/8811893103.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/zipajaxudiz.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/zusunatirugixukirubirijat.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/83634345584.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/pivisez.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/relagumujeke.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/diwutabarijudawalekala.pdfIn PDF document text
    • http://vaynhe.com/upload/files/gitoguzuw.pdfIn PDF document text
    • http://infunplastic.com/d/files/94060283018.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vixex.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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 10232 bytes
SHA-256: f0fe1c57b46807cac43eb711c67aa421dc5e5fe44d656261a4e9fd963443e117
font_02_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 17052 bytes
SHA-256: 33cdf3ad64842deb1198f703fd758ba4a214b9259e023b5555dab7dd8fd8bffd