Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8a1f4a65307820…

MALICIOUS

PDF

72.9 KB Created: 2021-09-10 03:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4782b8500aee8eb1eb379bb8fc318a03 SHA-1: a4c58f3f705827b3574c618a42d3e5cfc760eea0 SHA-256: 6d8a1f4a65307820a4d65cb94d63393538029a4b36a91db657946506c24a5f25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, specifically flagged as a phishing trojan. It contains an external URI pointing to a URL that mimics a Microsoft 365 login portal, strongly suggesting a credential harvesting attempt. The PDF's structure and the presence of numerous links to disposable domains further support this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=365+email+login+portal PDF link annotation
    • http://eiak.org/upload/editor/files/97106081787.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/wewajulurupeneganiput.pdfIn PDF document text
    • http://malifer.hu/upload/file/torizanoxotovibivix.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/25572897267.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/41376614975.pdfIn PDF document text
    • http://svx.su/ffile/file/15139070298.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/82010996344.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/gademumo.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/10152278078.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/94789073980.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/94895398044.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/17377592314.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/zakamozuvuredonapekizos.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/72326966816.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/doxezolagebugabamividu.pdfIn PDF document text
    • http://xtra360.net/campannas/file/verovavo.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/52253030514.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/gogobigutodanibup.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/49769898074.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908153312.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/62476432705.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/64231189489.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134634892692---runamobom.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/88176579517.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/zuluranik.pdfIn PDF document text
    • 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_off0000b949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB949 10804 bytes
SHA-256: b8c8fe6c792797fc100e08babe30190e06506ac82da03259f1393f86c97ece69
font_01_sfnt_off0000d220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD220 16904 bytes
SHA-256: 19a2275cf6ba14ffb9c4a9f83b2c2ef5946d2de2a8b83e2755f222d8a79cc5af
font_02_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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