Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4d9f315d40e1f7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 23:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06614cd191cc0952b69b1a251db7eead SHA-1: dd6ddf0e85efeae3de03fd1c2d48c6cdb9e4d376 SHA-256: 4f4d9f315d40e1f781bbbd944d0c48abd67a6ab4bd9fbda061ded566038d078c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is used to redirect users to potentially malicious content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.jindatunnel.com/up_files/file/sigebunatonuriniganikige.pdf In PDF document text
    • http://bajcsidavidfoto.com/_user/file/14775525230.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/3600727547.pdfIn PDF document text
    • http://palami.by/images/file/82730232107.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/94248510919.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/24005571869.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/jufabuzozataxo.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/71689359188.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210918_4FC1B0BDEEF3006B.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/82885634625.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/30737531675.pdfIn PDF document text
    • http://snsi.jp/image/news_file/49465152630.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e858d9252457036ec204364c3a5492c2/kumiguzuvujazugakulerakat.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/wazup.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/53803183017.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/68022501303.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/54698350586.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/30294641604.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/29487616860.pdfIn PDF document text
    • http://bakoca.hu/files/file/41185442597.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/111450337824.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/daxuzemuretaku.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f89c888d76054464ee658fa6981ef639/40169103591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=episode+game+free+gemsPDF 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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 10576 bytes
SHA-256: fd7d3c728f1bbc2ceb44f4631113ca3665fa2a4828eb0b9ae9156cb1ce6a4a52
font_01_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 17320 bytes
SHA-256: 9cb55b8cbdd387b08217f1a085894c661cae916a17cd83ca10f4ade42fd234f4
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1