Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0df9859fb8a089…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 18:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dda3b5f50929667fbb9e73fbc3286b34 SHA-1: 0517cde7e5d340852ee04ef35b94a9e7a2b650d8 SHA-256: 8a0df9859fb8a089b3287cf927b8cc99a3c548092319060f93d4c608e6cf39e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external URLs, many of which appear to be part of link farms on disposable hosting, further supports a phishing or malware distribution scheme. The primary attack vector is likely spearphishing attachment, with the PDF acting as the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://medvor.ru/uplcv?utm_term=persona+3+hanged+man+social+link PDF link annotation
    • http://www.hydro-tg.pro/upload/file/nivenetaxatuzi.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/85047684940.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/zibulinivupatizagesoxap.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/nefinim.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/muwawetaratawisudexonaki.pdfIn PDF document text
    • http://st03.it/userfiles/files/68949735872.pdfIn PDF document text
    • http://mobilenmr.com/files/files/60012654819.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/92158291759.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/lesabolixufafividiw.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/nelekujavejaj.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/86993464008.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/lafamozurizum.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/91291528993.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/dovameguderapejavijo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161484f9cee319---21320401285.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/sixunafemoxabosije.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/82025934799.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/95836623163.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/bonuxemubuv.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/50902250425.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/wixixu.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/vamejuvunelipagok.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109082205235262.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/bukaroramidow.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/24372436780.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/jetorefuruxolel.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/zekidijixinub.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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 17820 bytes
SHA-256: 19cdf45636a602378116119114be01fad3b61682e67ae88e7d120a6bb5d00e4d
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 10984 bytes
SHA-256: 78fab745eb947a35ed72efe1ab797ce75785419c7f02af6878ee51477be6b341
font_02_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1