Malicious PDF — malware analysis report

Static analysis result for SHA-256 6123178839fe3296…

MALICIOUS

PDF

94.6 KB Created: 2021-09-11 00:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1526157820b21647c379e96d36112d9e SHA-1: 248117d09fbbd31d2e624e2a45acf2f5a390eef1 SHA-256: 6123178839fe3296dfacb5c1a6afb7b3a93a061e4e2db518f1ea2b29e4aafc3b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs indicate a phishing or redirection attempt, likely to lead users to malicious content or download further stages. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553dcc7f97---99586761330.pdf In PDF document text
    • http://elistaprezentow.pl/userfiles/file/99055410042.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/fofikururerewir.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/rugeraxe.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/87540991521.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/95901119570.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/88001921363.pdfIn PDF document text
    • http://esangsok.com/upfile/files/5111718249.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/luxezezasoju.pdfIn PDF document text
    • https://preciseenergygroup.com/media/52367406364.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/giwiwe.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/90965771351.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/38845376634.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/77016332826.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/94435112174.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kekusuruxudeniz.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/82194156943.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/tuvizafela.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/21501389211.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/671909550.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/48005772164.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210905062952.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161362017be4ee---kowuwaxe.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/61435832833.pdfIn PDF document text
    • http://ebus.cn/up_file/file/gewuzawamobokedil.pdfIn PDF document text
    • https://ikansambel.com/contents/files/83733706380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=get+followers+gratisPDF link annotation
    • 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_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 18416 bytes
SHA-256: 5ebe6a6fa5a6f33cb5c982747d1e3495f29db285673ddeb3aa5985e94a0d3d34
font_01_sfnt_off00013d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15571 10412 bytes
SHA-256: f353a9105827295d6bd3c9b85d4203b17f12a5099b89b6b5840135a515431af0