Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dfcd1aa9e71dc8…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 03:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90ca1cd8e9959e2764e90ce2d98f3f02 SHA-1: 7d0337fff4f5c86c3bf30e0e500a39312d828010 SHA-256: 85dfcd1aa9e71dc85384ee44b9ab6f4efff39f5bd0ff44d64da18a441dbaf1f3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a fraudulent support number, likely related to billing or security issues. While no scripts were explicitly extracted, the presence of numerous external URIs and the PDF structure itself suggest it may leverage embedded JavaScript or other mechanisms to facilitate the callback lure and potentially download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=free+steam+gift+card+codes+2020 PDF link annotation
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613183717c78c---sufajajano.pdfIn PDF document text
    • https://istanajp.com/contents/files/48405054318.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/lujepe.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/dawejatoduxirijeli.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/11854726619.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/pomafo.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090209424673499.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/4073114491.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613537e2d2c9b---noxebunufugaketumuvi.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/48685263826.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/61316695362.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/mapijividubekudoduluw.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/90886906955.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/54997985825.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/xepumopunotuwiwejaxobux.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/welixumezevavuroroleralot.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/finurakasovobufeponewab.pdfIn PDF document text
    • https://luminex.pl/upload/file/54638769275.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/52225124876.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/93827361927.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132182cdedb6---wixazevadijabajanub.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210907135337.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/nevifajawitoxezig.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_off0000cfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 10888 bytes
SHA-256: 4fe6323d6dfa0d500593de5309406646407efac1a4a03f538a7c34746f82e53e
font_01_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 17792 bytes
SHA-256: e8e33db9c96ea8df47458efc79a294b53ae0c1ff329dbb9f5883b0d935c7c877