Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5d0038a59e0455…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 04:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14cf921c73ed04e67c715d014de59df7 SHA-1: 7e4931c2ecbc8b1797637ad37b3e2e6f1bdc684b SHA-256: 7b5d0038a59e045565a76c3f47cb677a3c3cabf7357fd3b0357ac2a24bd167c9
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to numerous external PDF files. The presence of many unknown reputation URLs suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://orosweb.hu/ckfinder/userfiles/files/wanigaxowaluvevizejipojo.pdf In PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/jetosowesovirafamo.pdfIn PDF document text
    • http://kezheng.net/Upload/file/rudunidunotom.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/69654531259.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/kowalisegajen.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210913021648.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/pawineseporowozapunu.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/mawipuvipelanavol.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/tixuwuwuwufumuderelunel.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/84438296897.pdfIn PDF document text
    • http://eternoohydro.com/d/files/15178236191.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/vebunekokenipepoxama.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/sufadaga.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/tufikutajupa.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/fabglpebkamrgvrr91skqtgadh/97244744455.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/43530610015.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/40551364675.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vuzawukawimazovexutemar.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/40181190061.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/44620629612.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/favexakarazebugof.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/sigonajolu.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/muxexoxipupijafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gadi+bus+wala+gamePDF link annotation
    • 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_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 18184 bytes
SHA-256: 18ffb336ba1c4e9a685656060c977ac6f6e0823ecd3bd7a1a39dc386bda62f8e
font_01_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 10536 bytes
SHA-256: 1cdd105f68cba32b008f147593d409285d073de9cf6a59a7aac5a3bdbdc740a5

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