Malicious PDF — malware analysis report

Static analysis result for SHA-256 c439f230e6eadb60…

MALICIOUS

PDF

87.1 KB Created: 2021-04-05 12:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23a109d313ea9a758179507ff3596ac3 SHA-1: e3ef9796e7dddc357d5dccaa3d8406c32218094e SHA-256: c439f230e6eadb604fdaa74e85905e455adc94642eadbcfe88cde7994b202119
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to contain metadata related to its generation, potentially masking its malicious intent. The presence of numerous external URLs indicates an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/award?keyword=angularjs+tutorials+point+pdf
    • https://cdn.sqhk.co/xisalaximel/FBgjhgQ/top_top_hot_pot_waterford.pdf
    • https://cdn.sqhk.co/peretudiwi/ijhJhe1/padumimovoxikuzef.pdf
    • https://muluxadi.weebly.com/uploads/1/3/1/4/131453645/b59c3.pdf
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdf
    • https://fisuzawagowesus.weebly.com/uploads/1/3/1/8/131857314/5296228.pdf
    • http://fevofawemuwa.medianewsonline.com/palmistry_books_download.pdf
    • http://yourdesk.website/boiler_water_treatment_processgb0mo.pdf
    • https://cdn.sqhk.co/bibunifez/PAjigfc/41579583224.pdf
    • https://cdn.sqhk.co/rewagujil/Uia5Bif/pinunevikifogixow.pdf
    • http://cookwellbakewell.com/beseler_23c_iii_manual3kb1x.pdf
    • http://gexomafe.mypressonline.com/can_you_see_diastasis_recti_while_pregnant.pdf
    • http://zasazigupat.getenjoyment.net/segment_and_angle_addition_postulate_worksheet.pdf
    • http://seplafond.xyz/peter_pan_inglesei9rd4.pdf
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/4418979.pdf
    • https://cdn.sqhk.co/dutaxato/6Xg8Dhb/14624074024.pdf
    • https://static.s123-cdn-static.com/uploads/4380691/normal_6005071a8d86d.pdf
    • https://cdn.sqhk.co/rejiwosujupa/7jfRhfE/makaforiku.pdf
    • https://cdn-cms.f-static.net/uploads/4386092/normal_601ee4430650f.pdf
    • https://cdn.sqhk.co/pakuvesajuwo/cIVLijb/tofotaluk.pdf
    • https://cdn-cms.f-static.net/uploads/4470698/normal_600ef652dddb5.pdf
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/3283560.pdf
    • http://nashremont.site/anaconda_2_full_movie_in_tamilp1rcv.pdf
    • https://static.s123-cdn-static.com/uploads/4458132/normal_5fe2133100d11.pdf
    • http://profibrend.ru/92814538432kybf3.pdf
    • https://cdn.sqhk.co/zijikunu/guS1Shf/funny_voice_effects_and_changer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000113ef.bin
afb5ea3a40727c73ab5986dfe17b6a35c76f6a82f9e937304bd49288898f9d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 5272 bytes
font_01_sfnt_off000125fa.bin
210c8c055a27eaf4e943aab9a678d39936116b22a90223686c17ac8eebf6fdc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 11856 bytes

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