Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18a63714cb093a2…

MALICIOUS

PDF

76.7 KB Created: 2021-06-09 17:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c4285503840746f88a8416109e3faee SHA-1: 6af9cad28922dea71a24938cef8e1c1c55def263 SHA-256: b18a63714cb093a2bc2820b1e321e8c484695e0540c85a85aed790904677c82c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be related to educational materials, likely serving as a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/123?utm_term=ncert+english+grammar+book+class+8+pdf
    • https://mejepizejuv.weebly.com/uploads/1/3/4/5/134528376/fesixidiri-bizufet-kuwobi-miriz.pdf
    • https://cdn-cms.f-static.net/uploads/4378175/normal_604836d2e53a7.pdf
    • https://cdn-cms.f-static.net/uploads/4374185/normal_602de95db484b.pdf
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5feb6b144966a.pdf
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/fixiwuf.pdf
    • https://cdn-cms.f-static.net/uploads/4461509/normal_603c205ad3bdf.pdf
    • https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/5e49ed799d2a.pdf
    • https://static.s123-cdn-static-d.com/uploads/4478951/normal_60aff9654d79b.pdf
    • https://nawikavo.weebly.com/uploads/1/3/0/8/130814462/7711935.pdf
    • https://kalozepi.weebly.com/uploads/1/3/0/8/130814360/9002149.pdf
    • https://ketatesi.weebly.com/uploads/1/3/4/2/134234598/de2ab3a28df.pdf
    • https://cdn-cms.f-static.net/uploads/4454043/normal_602ec0d34ff57.pdf
    • https://gurosutu.weebly.com/uploads/1/3/2/3/132303194/82670e667465dae.pdf
    • https://static.s123-cdn-static.com/uploads/4377902/normal_5ffcab7a72577.pdf
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5feb094942ea1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cee19543-93f7-4c5a-98a7-5bd43dd458e0/nejutagof.pdf
    • https://uploads.strikinglycdn.com/files/9820ad5b-6977-48e6-88d3-c47ad34ed34e/common_core_math_standards_california_6th_grade.pdf
    • http://xojipoxar.pbworks.com/w/file/fetch/144559251/43421048151.pdf
    • https://uploads.strikinglycdn.com/files/d613cd7a-d64c-492c-a95f-f1497feafd00/aapko_bhi_badhai_ho_in_english.pdf
    • http://mepijewaj.pbworks.com/f/47765228718.pdf
    • http://jeselivid.pbworks.com/w/file/fetch/144620427/70051004292.pdf
    • http://fotowefufet.pbworks.com/w/file/fetch/144915249/denepatufurumiwufujirow.pdf
    • http://vemebana.pbworks.com/f/exceptional_c_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec66.bin
a24472256a99cd7172be4ead02ba17a4ec6422cb2c0b598a548e747a81a35ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 5936 bytes
font_01_sfnt_off00010072.bin
e5348e8c1d594a2b3dbd6a2076658f3923205cc212051c572ffdf9ffb05f5621		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 10720 bytes

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