Malicious PDF — malware analysis report

Static analysis result for SHA-256 964465d714b8c0ab…

MALICIOUS

PDF

89.4 KB Created: 2021-10-25 07:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7b806b4dbb6e69b6e5227f8f6d1ab5dd SHA-1: 7815e44d79a949db9afc85d8fdd0044fcfe20db1 SHA-256: 964465d714b8c0abbb7ece30d7a75a9b574ec1ff806509398b3e60f187ffb816
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious PDF files. The primary attack pattern involves directing users to a network of these disposable domains, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • 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://ct-tci.com/cttax/userfiles/files/62021032174.pdf In PDF document text
    • https://bongkartuantakur.com/contents/files/58812427048.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/jojopa.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/54851970697.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/30504637004.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1616b433ce2dba---54203996020.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/84200646507.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/66324386660.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/43141520613.pdfIn PDF document text
    • http://creationart.hu/files/file/xonofinozasasusobupa.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/21541401749.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/64151511313.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/tunoxa.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/f39s7nqe7tiqni12ijur1i2vt3/79144923787.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/56596675727.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/8101290143.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/jaluwe.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/jafiki.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20211024201729.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/jozigebonizufar.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=3+world+countriesPDF 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_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 10460 bytes
SHA-256: daed851fa6c3e49112248dca9e0dc0f9e96123bfd844092bea2b16e210eb298c
font_01_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 16704 bytes
SHA-256: 420fcb717bda5b50be471047ea4668c7b011367a768eff541f121f6bc5c1da11

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