Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1973b28c42ef6df…

MALICIOUS

PDF

96.7 KB Created: 2021-09-10 04:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd4433d4a1501d5d27b011d55ce3e37f SHA-1: 9820c8705cbfecd8ba37a09ce21dbffa2069379b SHA-256: d1973b28c42ef6df0c179b820692de3d3bcf65e6cb5e6ab62529c79437958721
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

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://garglob.ru/uplcv?utm_term=watch+online+wonder+woman+1984+full+movie PDF link annotation
    • http://sten.kr/club/data/userfiles/file/20210902184522.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/62144189246.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/zoxixukijon.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/23266884573.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/36106644192.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/gitivejukizagijej.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/62222398442.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/51091935506.pdfIn PDF document text
    • http://it-hair.com/userfiles/letasujevupireke.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/11585045425.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/11965415371.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/43845079235.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/27349410120.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/felezaxa.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/burulirubewoloremesaso.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/ferodagelofevev.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sudabadu.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/vagevanifewikuratopa.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/93371259307.pdfIn PDF document text
    • http://tianfonmm.com/d/files/nexovozulin.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/doxes.pdfIn PDF document text
    • http://punaide.com/userfiles/files/12587456292.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e82b5e13e3ae729b6f25b72e61e8666d/65525762986.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/nabumibobibezuke.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_off000112d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D0 18136 bytes
SHA-256: 7e5448f794bf0da0aaa443e6caa0ec41d42804405e0eebdd8ca505fd6df060cb
font_01_sfnt_off0001423f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A56 11324 bytes
SHA-256: e255f42d041827eeda2476ada6eedc62de39f1c5a2989fea855e6caea2f7cf0b

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