Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c521605051b4a52…

MALICIOUS

PDF

77.9 KB Created: 2021-03-28 20:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 960f55992749b8d1542f2cad6a2bb1a4 SHA-1: a5695d06b2ede3efff6d58cbc2adbaef03025888 SHA-256: 9c521605051b4a52e5f7cc21c05615dab9435f29dd1c0da7ac6adfed6d1d37e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs point to potentially malicious domains, and the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/wix?keyword=cell+transport+study+guide+worksheet+answer+key PDF link annotation
    • http://lnstagram-help-businesss.com/xilifakobawektfrrc.pdfIn PDF document text
    • http://how2clever.com/what_is_208cc_in_hppzwdz.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://generalmassage.online/tres_metros_sobre_el_cielo_subtitrat_in_romana_partea_3en239.pdfIn PDF document text
    • http://neo-tp.ru/vovilavifu2bzek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/3._2_differentiability_worksheet.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_b196dadb05f64c1e8ea5d71cf5921904.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/joterige/26315552175.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/graco_portable_crib_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c3a6f4-3f62-4486-9f62-559c54c63030/technical_drawing_definition_for_dummies.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/39248513570.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_92c0d4c2cbdf4ea49f9f7675105e332d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72b72e0-b170-4b76-b243-d3556209485c/6896845987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7a1ff5-4c13-4d44-88e9-5a9091ab387d/42912935542.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/xefaketojufasuzigu.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/54429229648.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_8b1137bb3cdb4f159d756cc30a8c7ab3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/professional_compensation_plan_template_gsa.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/neco_agric_science_question_and_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07fd220-5833-4f73-8cc1-b9b1abd875dc/how_to_reset_tp-link_av600.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://scripts.sil.org/OFLIn 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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 5384 bytes
SHA-256: c10718ed08103eb0dfcb435fb22e0d6b01571199ea121aaf725a541f996b5218
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 10540 bytes
SHA-256: e709a21c82b930f9630bfabe6a7f9412c9b66afaaf6a058dfdd6ad5f2223d903
font_02_sfnt_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995

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