Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3288d5e29f93044…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 16:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8bea31015c9ab3db9922f1cf5ae48e43 SHA-1: 67ecebd0424ba1c3564ce608871022f6aca4eed3 SHA-256: c3288d5e29f9304446d3cb8354b28aa4091005df2ca39ed7064b2ef80b5a8cbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Static analysis revealed numerous embedded URLs, many pointing to PDF files hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of many external URIs indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=no+escape+room+full+movie+download PDF link annotation
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/82404212328.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/turajalisa.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/77778504016.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/70929668320.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/88672292735.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210903051606.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/53758997425.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/30239815073.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/pebevage.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/49711077429.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/30342593837.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/84407622915.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/fefovonuwuku.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/jirozik.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/tegarexejabida.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/95184726310.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/73307156582.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/xoregitobozudo.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/sogugoxebukodiri.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/52686927431.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210904180347.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/37645458990.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0p09o4cc9j9epvu6ajbp8bkaf2/jigobebodirogeraxat.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_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 10912 bytes
SHA-256: b7669574617d9f48729fbe1d4c7624737f802510597de343ce13ab9b2478fab6
font_01_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 17956 bytes
SHA-256: dc04fdd33239536005995e28b2a04f476e5eb2b5a530d1c6a4bf760dbad894b9
font_02_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1