Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d418fd604a3b26…

MALICIOUS

PDF

78.7 KB Created: 2021-03-13 22:25:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc266444dc0436db0e994dda1dabf66a SHA-1: abfcbc083acc7ec2914e84ba3aa8e198fa82b27a SHA-256: 73d418fd604a3b26ccf4f8304184f6853369afa01cc2c285e489d86fbd9ff1de
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with one prominent link pointing to 'vilenefex.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=9th+class+chemistry+notes+pdf+karachi+board
    • http://mijakaku.iblogger.org/94418496361.pdf
    • https://cdn-cms.f-static.net/uploads/4411218/normal_601eb8b5a42fe.pdf
    • https://static.s123-cdn-static.com/uploads/4387821/normal_5fe1ad902f954.pdf
    • http://xuxesuvetazu.22web.org/10442460384.pdf
    • http://nevozepamuj.iblogger.org/filmywap_boss_movie.pdf
    • https://cdn-cms.f-static.net/uploads/4374185/normal_600c6d58b4486.pdf
    • https://static.s123-cdn-static.com/uploads/4484605/normal_5fce55a017ccc.pdf
    • https://static.s123-cdn-static.com/uploads/4390660/normal_5feb4a20f3e2b.pdf
    • https://cdn-cms.f-static.net/uploads/4474231/normal_60295f1f95801.pdf
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5ff7d625321e6.pdf
    • https://cdn-cms.f-static.net/uploads/4393349/normal_6028b37b470c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_bc36cd845275484788cb9905df46657f.pdf?index=true
    • https://s3.amazonaws.com/daxemo/monthly_budget_spreadsheet_printable.pdf
    • https://s3.amazonaws.com/fajixe/poe_beastcrafting_guide.pdf
    • https://s3.amazonaws.com/medaliwifufugel/assassin_s_creed_odyssey_dlc_pc.pdf
    • https://s3.amazonaws.com/jevopemosod/pedurojukavixopakafo.pdf
    • https://s3.amazonaws.com/litunux/84686357345.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_bd960732ad7a456f9c329784c3f0d01e.pdf?index=true
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_42abcc1a4fd24c16b1dbe31bb1e48704.pdf?index=true
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_788b2cc34d414a219a5b9cea32721fd1.pdf?index=true
    • https://s3.amazonaws.com/bejokazemur/metabolismo_tv_libros.pdf
    • https://s3.amazonaws.com/jadudusujuje/46701654422.pdf
    • https://s3.amazonaws.com/werowibovezoje/9062771130.pdf
    • https://s3.amazonaws.com/radubozufiwo/age_calculation_tricks.pdf
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_9a80ca7df5cf43fbabf34768df37c70c.pdf?index=true
    • http://wedutatitupaze.epizy.com/corona_renderer_2._0_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ae.bin
683623a50bd2739c9c83e58dae914ec5f75c3fd1aaa98c46b96194a710fad354		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 5548 bytes
font_01_sfnt_off0000fb5a.bin
9f136c828e1507fcf7d6a7f47b7576ced15ebc7e860171fa4901026b824fe45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10160 bytes
font_02_sfnt_off00011e3d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 4324 bytes

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