Malicious PDF — malware analysis report

Static analysis result for SHA-256 544f2545b9f12a00…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 08:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aaa8c92e1643c3007bbf49c7a6d32c94 SHA-1: 83feb055c1bad1a42aedc2ca63b8f2414604882d SHA-256: 544f2545b9f12a00b6dc6a134cff568f3e89fad0da9a7f62100f022f00dfd0fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, a common technique for executing malicious code. It also features a large number of external links, many pointing to potentially disposable domains, suggesting a phishing or malware distribution attempt. ML and ClamAV detections strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/41b35e966ac5327d934c85e595094543/kerupazenapuxadidof.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jt2isd3dp1v79loumec4o17nlm/4908038058.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/rezilatunelidob.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/24151284963.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/97854296586.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/14069937488.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/tadebupogukosojodovemus.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/35247958754.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sidutepudomanajamakofi.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/88307367474.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/64009345232.pdfIn PDF document text
    • http://e-sportis.com/images/upload/babupamuxo.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/53363129711.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/govobezusamuruxu.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/74960306175.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/dudujopazebopegigabiv.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/59468826899.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/dujavezamadonevixib.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/82976800516.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/92397030369.pdfIn PDF document text
    • http://abnicum.com/files/file/83596976381.pdfIn PDF document text
    • http://tid.vn/upload/files/22664627356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+text+on+android+tabletPDF 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_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 10392 bytes
SHA-256: befcaeaa23c6d4eeb92555f169707d7fbb5b9a8ecf5571888cb2845517eae1da
font_01_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 18176 bytes
SHA-256: a472f2c379b753b196590b27d03ece3ec3266d0e9421560e7d639a363be1697d
font_02_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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