Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b2650a84672449…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 00:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a8328da5e27341672ca32e1b72b87ee5 SHA-1: f2bc4b66543594d6f20b598fd69d799db8022c9a SHA-256: 59b2650a846724494af7ebd7ba407d433abfc104c13e0337605871a1f2aaebbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a link farm, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=recover+from+broken+phone PDF link annotation
    • https://marosme.ro/hirek/file/14407125023.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/46101322257.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/kebovixomosebawa.pdfIn PDF document text
    • http://elskenecologie.nl/files/18493815661.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/80896605391.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/bosajonugofovekisubedesa.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/69048439221.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xutesadivediwi.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/62780082173.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/17623135115.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/mosilupuwasow.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/37581550148.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/vuxesamefetokazutivinive.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/20663189947.pdfIn PDF document text
    • http://synowka.pl/galeria/file/dolewovifaliral.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/lefukodaliwax.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/65274817957.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/76693821023.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baaadc7ff3---pimulifon.pdfIn PDF document text
    • http://trubaopt.ru/content/file/10324223697.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/revubitelaregenoseponukev.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/roxegopojevadixu.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/34895203500.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/xijev.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_off0000d21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21D 17468 bytes
SHA-256: 359912e55735d3140ce5459a79912a57792479808317c5444feb585bf4c68a24
font_01_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 10520 bytes
SHA-256: b3cb0769ede4bb9b21de76bebb07adf59311dab08ed75cf86b680a25d9a80e49

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