Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cfb9b4fc1070ed…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 13:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0694990434dca2481108f4bbd333dbf3 SHA-1: 4c6c2285c294a05552036624c1ac7e677f578f31 SHA-256: 27cfb9b4fc1070ed2c9ec9e31eef3c7f50c09c7d8f28b48c30273ae1e7167d0e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The presence of numerous external links, many pointing to disposable domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24353090731.pdf In PDF document text
    • http://ogledalata.bg/uploads/pages/files/ripetexizamifevenojebewa.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/27462420265.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/51955090417.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/zuzum.pdfIn PDF document text
    • http://kite-surf.sk/files/zopek.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109090159078436.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/21457394041.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/xujokajadapirubu.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/40056628438.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3fh2rc1gluvksd9sgptak45oj5/mutenesopo.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/71965709496.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/tonebasat.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/guwojinug.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/6113059239.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/70428148167.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613509c517c6b---92031442070.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/22513851389.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/92600995917.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/41445527455.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/variluzurunajes.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/51873282760.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/90806411112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=transfer+big+files+from+phone+to+pcPDF 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_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 11028 bytes
SHA-256: c18896d6cf237d2637f135fcdaa1f32b4c7830992046f52d89092aa8714d1127
font_01_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 17000 bytes
SHA-256: 775098863711bd9cca43750b45cfdf5345663d79a9b14ec20531a9716a8ce49a
font_02_sfnt_off0001354a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1