Malicious PDF — malware analysis report

Static analysis result for SHA-256 debf51f86f8bf4e0…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 11:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d343199f3a57b32e8303806dc237b1f SHA-1: 1c6630fb2e291ea7ecd82f0685f72ebab390fe7b SHA-256: debf51f86f8bf4e0164af9367da024a230171749f6ace9dcca26978a5ce98918
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, including one pointing to a raw IP address, suggesting it's designed to lead users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that this PDF is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/126a6f2e796d43ded35de70f98b44228/90926521342.pdf In PDF document text
    • http://studioschicchi.eu/userfiles/files/17417306189.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/46296332536.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/70640624939.pdfPDF link annotation
    • https://coebmsf.com/userfiles/file/76782303564.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614469c85dd08---86204649027.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/pemewiketuvesiwafulapogig.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/36874703851.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/90570632880.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/70105784960.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/26906711856.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/dasuwudojevet.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/8179835825.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/64954778655.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/41767635413.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-20/20210920192906307219.pdfIn PDF document text
    • https://eklyps.net/images/file/82993584642.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/85777103850.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/kevidatezutesorejizexuri.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/jigewi.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/11323056760.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/10069576796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+hero+siege+pocket+edition+apkPDF 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_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 17608 bytes
SHA-256: e5133e2f4ceca7bd09bee2e1b38558f30355e2746ba6c5d558fa67c42dfe870e
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 10972 bytes
SHA-256: 360a5d80ef1cc1c00f15ff8ec550224565e984fac217b6f821865b8f3230faba