Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8735e4c00abbd6e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 21:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0476ec974b94033cd715f26495ab81d8 SHA-1: 9c1d8274661f6742c632cf35e78146ba8abe9593 SHA-256: b8735e4c00abbd6e524ccedf42c4c12811c94c718179515a241080953605898c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links to other PDFs, likely as a tactic to obscure malicious intent or distribute malware. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dayuntang.com/assets/uploads/ckedit/files/20210908091521.pdf In PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/12348487732.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/rifoxawibulisibefidiz.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/i77h3aa0n6bi491eqa1gr0dctd/96165625815.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/wadimipidegobariwediw.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/93745a72654c644e3c1cf2964074ec67/7352027807.pdfIn PDF document text
    • http://scsychem.com/upload/files/jivezeluxi.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/76086903466.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/lodone.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/mabevinawajisesagi.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/faxupi.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/gakuwivi.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/85525167204.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///lomalu.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/88948629626.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210916112804.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/83217723615.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/94813630444.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/donigoramimanogofuvil.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/68049934574.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/16917418520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+yu+gi+oh+bam+pocket+apk+dataPDF 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_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 19216 bytes
SHA-256: a06f8ad8edc0e285582df78c2c0765d5e25a86db94c3c09c7a5103a6b4d81219
font_01_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 11224 bytes
SHA-256: b878d6c5213ef07d564d3134aea332436909672826164284cbfd17e9b64c9f47

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