Malicious PDF — malware analysis report

Static analysis result for SHA-256 12915df76c78425b…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 04:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c6863a8ad3212df3cf56588849b5413 SHA-1: 75c13a5f9cae7154443295278a9f54009f1ac4a5 SHA-256: 12915df76c78425b2b73356529762ed52e6610c94a49b6848fce7d619071708b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or redirection attack. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver secondary payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://medicabg.com/uploads/wysiwyg/files/mededasudukubej.pdf In PDF document text
    • http://fs-select.com/images/blog/file/14346721740.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/20eaff98f7e5cf0efe2d1df5eb96476a/katavivogabulopase.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/86213272804.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/80578843694.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/bawoxarapilimejavefiv.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/18350057482.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/bukopelugovetu.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/sasafuxejananikixitajebiz.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/88918661530.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/xisapefabezesajegejigo.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/75012893826.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/66641592695.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/juzinajenafidig.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613999ac60c2e---40025199030.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/28683564564.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/28462066622.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/52824133450.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/12816004159.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210929002353.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/18415723998.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/voreza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+magpie+society+pdfPDF 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_off0000b02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 16900 bytes
SHA-256: 79679e3af11382fb2e1e96228cda879976273d0c024a3e3e38fba9a9a7cfa326
font_02_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 10892 bytes
SHA-256: 9da66cb02c3c89a7391218389516b76d2c42c9e482765f49a78548747f354dcf

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