Malicious PDF — malware analysis report

Static analysis result for SHA-256 651d3f4d21ffbf26…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 20:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d909f6de6a9678be5ab352928b5d21d9 SHA-1: 5ee14471085fd408fd9fcead42246056c3fb768a SHA-256: 651d3f4d21ffbf26bd9a9eada9d9bd1956f5c589c04dba3e324cf938f64dea5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://cructi.ru/uplcv?utm_term=dan+the+man+mod+apk PDF link annotation
    • http://ivankotov.ru/img/lib/file/lipefofunofe.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/24959577715.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/wuruvatoluzunezudawogofar.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/pobetufum.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/busilu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab8a8fc67---89205656934.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/26151695346.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/11306179692.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/nibumizarelurimezinobu.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/zitodamo.pdfIn PDF document text
    • http://foxhill101.com/userimages/23322780840.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/13824145126.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/fakiwatufoguji.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/xebodetefujujukopodananu.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/dosarubibinuwapol.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/84618321991.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/3372579249.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/xomodabamak.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/87332389905.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1e240a13---67222793851.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/ratatubu.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/64128514347.pdfIn PDF document text
    • 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_off0000afc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC4 10344 bytes
SHA-256: 79e915aaca659b11e23715ed8bd0c0f77c14c6303397f201c52dddbaef095355
font_01_sfnt_off0000c6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DD 16436 bytes
SHA-256: f8dc7b8db06adccc958d9214b35ae82596f36c722695955bb68ea8fce3800371
font_02_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1