Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac59ca780031426d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 03:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bbfa7a2c50d380a83c6dd5a8ca43ba3 SHA-1: 1b049a002b3b9a82b275232b09118d2c712f30a9 SHA-256: ac59ca780031426db371d2857f7d9f7c16717359318472c1369b3c2f0c235363
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The presence of embedded JavaScript suggests potential for further exploitation or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=sonic+mania+download+android+apk PDF link annotation
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/rixazujurarolisugexin.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/5792739290.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/gowisopemo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419de15beff---42390177012.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/72258904483.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/puvetawunajid.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/doragugotabum.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/66863048956.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/20665297285.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/pabolanawidugizi.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/59974516327.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/jogiberijufafapisokigane.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/18168344586.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/96022767825.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/domirenodab.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/begokurasux.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/gujaweletadi.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/siradoxi.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/xemuw.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/tudozup.pdfIn PDF document text
    • https://orrizon.ru/images/file/wisejaxi.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/jusobomob.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/rezomugi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f3de8779---xabekiri.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/wiwisada.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/witelevikej.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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 21976 bytes
SHA-256: 9b5d902c72f972d68fd9703c9227496b412dfd7d558e7272e1db05aab898a155
font_02_sfnt_off0001314b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 10528 bytes
SHA-256: 780e0d702885507a20f3217db12e7e19192699519a6a483f35d0c63bd10ae111