Malicious PDF — malware analysis report

Static analysis result for SHA-256 b782162c8a22911a…

MALICIOUS

PDF

92.2 KB Created: 2021-09-17 04:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b3c5b955abb3f16e3333b9dc99edc56 SHA-1: 6de7b1275d51ada678769b23767f1d43d02496e2 SHA-256: b782162c8a22911a529ec9d9233a30872ba774be9f65bb4960258416e68aa80f
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a payment redirection lure, a common tactic in business email compromise scams. It embeds multiple URLs, one of which is identified as a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://maroba-zirndorf.de/file/zujumikejufunijeduratu.pdf In PDF document text
    • http://yigang-lin.com/uploads/files/202109061412426019.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/35965918760.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/29364737408.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/dujedi.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/pofejuveximolo.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210911123821.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/filirowil.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/kutijipepugojabip.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/25224154044.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/filisaxurumikekafile.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/ronopazebivikasutupavika.pdfIn PDF document text
    • https://petikdaun.com/contents/files/82542872200.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/29935085081.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109042009384638.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/xuwomidalanubav.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/21033215301.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/xikagoxe.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/cf39866d2adc1776d890f10d05124960/jugatonef.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/30560347347.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/xuzofivizumikawurodifa.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0a78eec206f7ebb8d8c9a7697b8eeba4/7254377650.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/71418644105.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/64601118105.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/rivujimere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lean+thinking+book+pdfPDF 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_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 18028 bytes
SHA-256: bb5673edaf25571d9b3f78ca6c88398022924fb2d88e0d9ba4c78159720c4886
font_02_sfnt_off00014b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2F 10652 bytes
SHA-256: ef7bb650c3ca01b1b530150013613b39474aa3215641c2d327d15a7fece797e9

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