Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5563faae1450e7…

MALICIOUS

PDF

84.4 KB Created: 2021-09-14 09:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7fbedcdb3dcf167c81fbfdaa881e49d SHA-1: a71128651de8ad65cf84c85fd57239d60578133e SHA-256: 5e5563faae1450e7e966be87a8b8eaf57e54fe8aa1a43a049e577405dbb7c368
146 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating a malformed exploit stream. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The PDF structure and embedded content are indicative of an attempt to exploit vulnerabilities or deliver malicious content, likely via JavaScript execution.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://heureka-cz.eu/files/74478939383.pdf In PDF document text
    • http://wonsakai.com/uploads/files/47527191644.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/soletomutomozozawenuw.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/10252874548.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/1651250610.pdfIn PDF document text
    • http://balone.net/_upload/file///dagejapofafotedonobemat.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/25005976428.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/jabiwowotik.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/78191316860.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/turovivaderut.pdfIn PDF document text
    • http://evola.it/userfiles/files/ratazumeligemu.pdfIn PDF document text
    • https://izometal.net/mm/file/12947927931.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/jerowegaderijifile.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/62233968072.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/23582760909.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/49475569856.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/75652634124.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210911174800_1587717672.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/82294820959.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8a3cda15---xegedosawova.pdfIn PDF document text
    • http://husplaza.hu/editor_up/11757012875.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/lowujukufuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=lightsaber+fighting+stylesPDF 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_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 10584 bytes
SHA-256: 0cb72baae1b616604c88b77a4f072e85a0e1984466f31f68a49b4e467a12e02e
font_01_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 18940 bytes
SHA-256: 416c924a956f94ecbc59a36bf218fb0b69a9de9638de4154d542a8555ec379d5
font_02_sfnt_off00012bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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