Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc060e20493d429…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 17:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 368b4a90bc3301c24ab086e1ce8378b4 SHA-1: 572a629e8e7a0b28ae0c29ae2cabf9d2d3f766f8 SHA-256: 4dc060e20493d429b2a662913cc74d58432635d29222879ebb26bcb5909cb0c5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains embedded JavaScript, indicating it's designed to execute malicious code. The presence of numerous unknown URLs, many structured like file downloads, suggests a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM also points to a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://doctornhospital.com/banglanews24/editorsfiles/files/10047725639.pdf In PDF document text
    • http://abwcolley.com/uploads/files/lutowesisedule.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/26593351882.pdfIn PDF document text
    • http://tzsunup.com/upload/mugel.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/sejogejazaxinejusovifu.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/dunamagoforinod.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/siwotivojikewunepoj.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/zojazumawegurugopakak.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/13481408774.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/pinekajiburibima.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/febepizi.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210906183304.pdfIn PDF document text
    • http://le383.com/uploads/files/88031204810.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/44134743710.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/5310066346.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/ravinofixijugixi.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/13004106340.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/3364016364.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/beteresezanonemuxaj.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/motasizas.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/famadibuveguxuromugafun.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/478ebc14e538a6d01d6acc08162996fe/67786603883.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109031502079736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sultan+full+movie+download+tamil+dubbedPDF 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_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 17692 bytes
SHA-256: 6cb5a9f676bc98cf95189c7b50cfb76ec55b41693c2d7a20a5be38c72c32c0cc
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 10712 bytes
SHA-256: 3258c1024b0844c5e6a39ce10aa20c2861722bfbdfa7420c3ff3a55f27497608