Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ce5f539e0efa42…

MALICIOUS

PDF

84.0 KB Created: 2021-10-09 06:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e033e3e9893dba85374c86d90224dd1c SHA-1: ff70a3568a9bdc518dbe1c2f5e878e325ca236bb SHA-256: 86ce5f539e0efa42d86b6b768ea67d7c0a3a2fae3ba4b7b97d25ea8296c43446
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown reputation URLs suggest a phishing or spam campaign aiming to lure users to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://veoguidecostarica.com/ci/userfiles/files/66282017973.pdf In PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/9640447439.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/61454053336.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/68046064555.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/99822481685.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/lelinitedekarawagebemuke.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/032c7ae99cde64db1dd8a7e76a239e21/vugawaboliki.pdfIn PDF document text
    • https://www.dtd.com.pk/ckfinder/userfiles/files/69313214661.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/putejurogikaziz.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/66144974875.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cedfb0b92---lemakonetelelazirami.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/51563922302.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/54997177181.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/denixodejigefegivid.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/nosepimew.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/kepopug.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210912033534.pdfIn PDF document text
    • http://strap.sk/uploads/file/65586660162.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/weruze.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/270605_62445140090.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/vevofewazexutad.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/teguw.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/34089679307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nutrition+and+dietetics+by+shubhangini+a+joshi+pdf+free+downloadPDF 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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 11444 bytes
SHA-256: 9c22cb728ed497efbafac920a81d3e9e45942dbf79121019aadbdc1c844304cf
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 19620 bytes
SHA-256: f7312aa2763d8a2c3d4d8e0c2aaf08c857f246fb3fa29464e10131d1c520e703