Malicious PDF — malware analysis report

Static analysis result for SHA-256 17acff3c71588f26…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 21:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 662bca0c0e4ae7557df7430f2bff1013 SHA-1: 927ae80f187c96f40ca3a1218d60cf5de0fbf538 SHA-256: 17acff3c71588f268a557ee70ab9deb572d9b48de859aea4dcf79c3e2df4fe7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links pointing to various domains, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zenithoverseas.com/assets/userfiles/files/28076451146.pdf In PDF document text
    • http://electronicaindex.nl/images/uploads/35281727761.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/7923895042.pdfIn PDF document text
    • https://aromamarketing.md/img/files/kipuwa.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/25117824021.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/90992287953.pdfIn PDF document text
    • http://decorstore.eu/upload/file/damukuvobenuvesij.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/meneb.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/fadovukigipazubujekewokal.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/satasaxeba.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/rotogojatukutumerewutib.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/wosizoxifepogotevewovol.pdfIn PDF document text
    • http://coumert.com/images/file/rovubasepifulenopew.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/98533702624.pdfIn PDF document text
    • http://hla.vn/upload/files/37378197804.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/23266435567.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/15090360592.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cad824fd3---48895653235.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/xakujosorisukedobe.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/49783581130.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/filowubadizetazivedebejez.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/susizuvavenejo.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/53902947619.pdfIn PDF document text
    • http://flirdining.com/uploads/files/tonisubexibojurupul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pitch+book+sample+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_off0000c04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04E 16552 bytes
SHA-256: 8f2426984e3bddf8839dd7f6e0f94d7d1bcabe224c3a75ff5b38819b3ab64749
font_01_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 10916 bytes
SHA-256: 54f3a25a251c91fe3189553d8d2185b7156bc1afd21ca690138586cbf2fb8963
font_02_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1