Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc7d491967cbd6e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 10:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42094b78dac50da2aeb1b5cc5dd82f78 SHA-1: 0a533af7289f034fb992778b15e3a298074c64dc SHA-256: cfc7d491967cbd6e32fa52e480371c7d53882adf39df3c9b0d62d854d90c69c2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and a heuristic firing for a 'Payment redirection / bank-detail change lure', indicating a phishing attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the detected lure suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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 https://cructi.ru/uplcv?utm_term=how+to+recover+old+snapchat+my+eyes+only+pictures PDF link annotation
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/kebipubesesawusi.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/levikukugonodatetim.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/99582758442.pdfIn PDF document text
    • http://sro52.ru/uploads/files/44117263034.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/28058269511.pdfIn PDF document text
    • http://gdgom.com/upload/file/210920103142195210bzn3hpev24ox.pdfIn PDF document text
    • http://www.buildonhope.org/file/fitibitorisunitepodutiw.pdfIn PDF document text
    • https://negaratoto.com/contents/files/22660603769.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/17919235902.pdfIn PDF document text
    • https://trexanh.net/upload/files/47037271318.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47877513299.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/lekanalabixexavovu.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/liwugilijibetisisatif.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/gozikofefevizegu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1ba828af0914b13d4719153b9210ff96/34092137540.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/sevumab.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/zajivetizotiwin.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/wogozotot.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/33999159789.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109011302553249.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tinurugegalawunafukabis.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/pejowepuzof.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/jemuniwites.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38dd7853c---95545739824.pdfIn PDF document text
    • http://proxima-design.cz/files/file/lanepizimebunibogesa.pdfIn PDF document text
    • http://slsnn.ru/content/files/63509777131.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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 11136 bytes
SHA-256: 3bf2c0d1eb64b21c04e54470177af9f5bb4986dc6f44eb2769f1464359f878ab
font_02_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 17068 bytes
SHA-256: 21dd942219742fc44e2abb7eb36d5cf08a5f3585e7267cf7070b93d55d2f4e8b