Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39db01efeaa56ee…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 06:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a43c8e6d1d57d248d4b979895b65e44 SHA-1: 47d16ee09fae5146a89e1217a5192c9706966e64 SHA-256: b39db01efeaa56ee7771b2168ccba99fb6f37aa479784e88600a22e3bdfd597f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs, some of which are hosted on disposable domains. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates a business email compromise tactic, aiming to trick the user into believing they are updating payment details. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://hong-tour.com/FileData/ckfinder/files/20210914_7B685B690F55E856.pdf In PDF document text
    • http://wingmanresearch.com/userfiles/files/popaziwusamuximonakupo.pdfIn PDF document text
    • http://labsshop.com/d/files/44452427290.pdfIn PDF document text
    • http://shosholoza.de/file/kibojepogukinivaloma.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/wanafesokomuwomefin.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/70050193829.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/56361511831.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210917202935.pdfIn PDF document text
    • http://eva.am/files/458658445f907fc6.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/fefapugoxiremupur.pdfIn PDF document text
    • http://usmleworkout.com/files/file/96378254990.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/kepuv.pdfIn PDF document text
    • http://wuchem.com/upload/files/81132208138.pdfIn PDF document text
    • http://bienbao.org/uploads/files/55234723657.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614060921a80e---dedolafedulukakugib.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/weliko.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/nokavizigapagiboxize.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/ruzopak.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/duzosiziwutuxonogakuwur.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/budasavatu.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db118809ef---riselifugesodafan.pdfIn PDF document text
    • http://talesma.com/E/file/bitukokolip.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/r6q80vbf13jrm20qs8kr12bcd7/95279279807.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/levewuvuvimotiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=upload+contacts+from+android+to+iphonePDF 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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 10892 bytes
SHA-256: 4a13c6799fad852e206c9b5488f992caa8770064c2bb8be1a913e039b2d0a308
font_01_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 17592 bytes
SHA-256: 9d3abc44c679c791d78cc9b7e76d16000abee6577d89ec922a806999222690e5
font_02_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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