Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf7bc06403fe9bc…

MALICIOUS

PDF

77.1 KB Created: 2021-09-10 00:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c565496b7ead7d7853ca8c2d86ab592f SHA-1: 9f54959421f60dfdc4fa51750a0338e8db293cad SHA-256: baf7bc06403fe9bc24e628c06a539df246200707eeaf366a16a0313947f39895
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the sample is part of a link farm designed to host numerous PDFs on disposable domains, strongly suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vibestedu.com/_UploadFile/Images/file/wosakiziwaninave.pdf In PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/33446572080.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/totupogemikefabunamoger.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/75274985347.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/mogod.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/bokobupetun.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/bosulusopolufexida.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/vuguwezilijereburimik.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/13971823671.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/zajubiwizolixiwogujafez.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/kapomejolelosovivinitun.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/24667094548.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/zabodozi.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/zafufalosokuranenowowa.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/52751649802.pdfIn PDF document text
    • http://dominant.name/userfiles/file/37123186956.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/pasalujutekot.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/dibigixogikukidogefogiboz.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/78238824351.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133958fcd4ca---lezapafoxoragaj.pdfIn PDF document text
    • http://inphilong.com/upload/files/971075249.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/1975316668.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/juwuwuwebuxedaloramutu.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/rerekafozerasuxi.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/pokalanetunez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+impossible+quiz+answer+20PDF 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_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 11156 bytes
SHA-256: a879efa2a18b9c8c0e163a56f2fe52d67a07d7b8235b207fb0a530fbb59faefa
font_01_sfnt_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 17384 bytes
SHA-256: 78e39069a685c2e0eb5ba4ac3a4902092545b7ecb2e55f6d775359d076bfc7aa
font_02_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1