Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37810ac510e1db3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 20:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd0d576714235a119d4a87e3755301cf SHA-1: 052dd01a8ba546cfcba629df2cf1a5212098821c SHA-256: e37810ac510e1db3e683dea75a0d56199a56a97bd478f21bea5802ebeee61892
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a payment redirection lure. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to potentially disposable domains, suggests an attempt to redirect the user to malicious content. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly indicates a phishing attempt related to financial transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://venus-forever.com/image/files/14886066813.pdf In PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/68049451436.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/57000508979.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/98669854641.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/47970900389.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/xakixixu.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/44324596448.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/67412451875.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/31546875689.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe313ed29---zudesi.pdfIn PDF document text
    • http://soupworld.de/upload/file/67336247715.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/kupivegesusaxogovekibipoz.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210908_CA053C3CE019B6B6.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/67459185318.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/jekazijimasozed.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/99022468338.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/lobidudexufanatazoro.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/72001216899.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/5564643996.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/20656585577.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/62962485954.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/g6471tfcc4a2vl8jd7n7vn28gm/42602225400.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/kerutelopiga.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/zakufapapagenuninulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+transfer+to+new+androidPDF 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_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 18052 bytes
SHA-256: 7b41762c74e0ff437fc9b814b50b5643279296132295c46efe1e8f3ab1d79d74
font_01_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABE 10380 bytes
SHA-256: 5cb4e7312988d1851ff25f69a931eefcb3fb91419aa85df2946e117987d4de7e