Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa24f2d490d5d595…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 00:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9164c4ea0171e9dc81ef92f3eecd4103 SHA-1: c69fc74d19e20f64f786920d329dd6ae7008c690 SHA-256: fa24f2d490d5d59578ab32f163a805a2fc8191cadb5ee269a46bf2179a30f9ad
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm. This suggests the PDF is designed to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=5+major+biomes+of+the+world PDF link annotation
    • http://antasboru.com/guvennet/resimlerfiles/87760080453.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210906_C7B686B06378160B.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/gukopab.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/41382921133.pdfIn PDF document text
    • http://ruihuitax.com/files/file/gosoxosawininifiboxid.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/jodesusifepaxi.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/21733558293.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/16879831750.pdfIn PDF document text
    • https://egca.fr/userfiles/file/nunexijil.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/43805191203.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/popodinafivelikaxikutib.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/56306840142.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/27267418071.pdfIn PDF document text
    • https://strechybenesov.cz/content/gaxaxodixak.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b618af11d4---mekelefovulopilovusove.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/65487805080.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/pasimebukoxumowo.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/96804737353.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/44467446661.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210906153744.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/bubixetebipajotatufubu.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/76116978252.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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 10908 bytes
SHA-256: 206b9a1472796536e444880aa4612c622722f6f3d28a22854f4729a494b24f4e
font_01_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 17564 bytes
SHA-256: ee483dc65a3312317cad71e15224401183232e46006616335574062e65182e5f

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