Malicious PDF — malware analysis report

Static analysis result for SHA-256 10dd31eac2bd0cb8…

MALICIOUS

PDF

112.6 KB Created: 2021-09-13 04:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9a83baa3b481abf4d8e875fd2490759 SHA-1: 6793f0cc82f3c14a92f897f44bdafe8fec7da528 SHA-256: 10dd31eac2bd0cb845cfffeaceb709660e9632108bba843cfb8435736ab482b1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further malicious content or phishing sites.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=the+bachelor+season+22+episode+1+full+episode PDF link annotation
    • http://kukubara.com/zdjecia/file/tekiz.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/30077484196.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/72460265206.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/62726710196.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/xifemawobi.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161318e3041ece---12343127568.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/99428653492.pdfIn PDF document text
    • http://greenld.com/userfiles/38946840987.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/96470163610.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/53964118116.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631369284546488389.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631444351.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/99486715047.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/55712374718.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/58070923894.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/milarisuvenogo.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/piperobipazaz.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210910_125153.pdfPDF link annotation
    • http://punaide.com/userfiles/files/nigolux.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/bapimesevep.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d02f24175---xuworidufinezexinuge.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/76382502048.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/52260760950.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_off0001509b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509B 10996 bytes
SHA-256: 0d3cad0e369d73c2ab517e74932ef1a51fe7d14fbbe1c28ecafcff8b13233355
font_01_sfnt_off000169e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E8 19276 bytes
SHA-256: 24283a042c8b63692cb76573d60ab9b5efd13b8bc0f95650f8e48953720389f8
font_02_sfnt_off00019c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1