Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c39f3fc7ae7fbc…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 13:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e87f2b9ce2d053049eba7af23e41dfe SHA-1: bbbc7804507b6f6b6ba9cc73e63fcd49687399a1 SHA-256: b6c39f3fc7ae7fbcd765cd0fd376c7fbff5c39aaa119183b77de58ca0bbbca27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded content are consistent with attempts to lure users to external resources for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://krisoc.ru/uplcv?utm_term=hotspot+mod+apk PDF link annotation
    • https://madeirashopping.com/userfiles/file/90088345317.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/nuwawepatutugupafaliwojer.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/vosezevu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202194136496537.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/dolegelepiritefonaza.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/71224462142.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///60852167948.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/dudowofivoj.pdfIn PDF document text
    • http://urology-andrology.com/userfiles/file/xalinikubifuduwaze.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e024bc1611---goturademasa.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/pixuzuwakizu.pdfIn PDF document text
    • http://pololanna.com/user_img/files/43332587136.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/43168030759.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/barorumatexofefepu.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/49572498136.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/kawakeradufonugofi.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/wajimugekinokajitejikala.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/82704245142.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/6870282629.pdfIn PDF document text
    • http://vecsecity.info/editor_up/sobebudipide.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210905040259.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/17697183719.pdfIn PDF document text
    • https://pqclass.kr/imgs/file/67346241876.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_off0000bb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 10160 bytes
SHA-256: c4a56685caa21863060eb15209aa0199dd66aa62b001c0609681f2b97604ba62
font_02_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 16756 bytes
SHA-256: d40d1e7fd71a69a21d7a9a7088d9836460200c6a917ccac9c8b55e973869c917

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