Malicious PDF — malware analysis report

Static analysis result for SHA-256 b953705cb208a049…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 17:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d164b07f4650dd940577d5f59265de98 SHA-1: f5b98fbaf85b732d6e55d0c3cbfb640e55dfbf88 SHA-256: b953705cb208a049ceb4328d5d8796f36635052546e402def45462e8a1aecc2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript, though not fully detailed, further supports the potential for exploitation and execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=fluid+mechanics+short+notes+for+gate+pdf PDF link annotation
    • http://be-now.pl/userfiles/file/weduxalaminakenoxibuz.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/4649047213.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/nuxime.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/25880521523.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/17508485369.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1ef6f5f0f3395ec09b49beb37eb0a302/ludeduzozune.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/tiloxilozisofisigosiram.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/74289597694.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/74105617967.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/12195948250.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/metob.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/17756932276.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/44168400579.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/95815167500.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zamewegoxawep.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/63057680400.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/30116138700.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/69299215624.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/nekowitaxugalapeg.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zagetuzugupa.pdfIn PDF document text
    • http://kite-surf.sk/files/43991635601.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/nizupepipiwumirediv.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/resulixu.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_off0000c534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC534 17872 bytes
SHA-256: c4cf17e86556a7f91fcf4761fa07fa5a717494c6825ebd125c718e381af10fd7
font_01_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 11144 bytes
SHA-256: 2c3787167a76fb69d7b48e8d33b759c447fbbe9aac54ff7501c34b2d67bdf9f0
font_02_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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