Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcc4cc996fdaee7…

MALICIOUS

PDF

73.2 KB Created: 2021-09-14 07:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6421ee8f121fe0dee2f5a5a24dae093e SHA-1: 7f929ca040a07ea908e78358a8dc82922e4a1202 SHA-256: 0bcc4cc996fdaee73c1469d0c8997b312f275c5b2a8168645ab5d4c74ed672df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified numerous external URIs and a link farm pattern, suggesting the PDF acts as a redirector to potentially malicious sites. The presence of embedded URLs and the 'Urgency/Deadline Lure' heuristic further support a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=robux+today+free+robux PDF link annotation
    • http://gaytonfa.com/upload/files/bupowamapalidapexokoru.pdfIn PDF document text
    • https://gencatakan.com/upload/file/todafeb.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/31172210304.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/51062678567.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/70097913738.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/jujedamedusemalotovuseri.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/20213638805.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a24c6636b9b44b8fe18c1022267f3098/banejuxosemolujazoxes.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/73028789651.pdfIn PDF document text
    • http://www.siposferenc.hu/html/10233620287.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/18974212421.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/31928136777.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/popekubaredujizibu.pdfIn PDF document text
    • https://btegypt.com/file/78502220565.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/xuvobido.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/bapafegolut.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210908201251127.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a7c6d686ee9f9bf99649f13b050b56f7/zokod.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/61313597981.pdfIn PDF document text
    • https://emenu.hu/editor_up/kuvavukuze.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/gunoliduvovefojidun.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/zutejik.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/17958980872.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_off0000bb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB26 10440 bytes
SHA-256: b64b7ef3f5432ecbfda3c08c168da37020babe09474c4e26c14e0ee152d32f2b
font_01_sfnt_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 17216 bytes
SHA-256: b7ab33cbe416ab8decf6a05c23b075671949b139d9d96706d52b70510fcc2350
font_02_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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