Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb85d4eb58598a3…

MALICIOUS

PDF

70.4 KB Created: 2021-09-09 09:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4eaead1c915c7fc39e56110ffb2fbefa SHA-1: e2cef4f3d01961a4520571f4d0ee98c7a3209635 SHA-256: 9cb85d4eb58598a370ca5be1a5ca998a2cf9ff21f09f77eef6866eca11576981
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various domains, suggesting it is used to distribute phishing content or further malware. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=all+season+battle+pass+skins PDF link annotation
    • http://lineshare.net/upload/files/20210903061543.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/92617530258.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/2476070736.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/15467621104.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210902001153.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/25502785274.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/kisip.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/36501530111.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/topajajopozovamel.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/bexexekewuxa.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/munezoxuwo.pdfIn PDF document text
    • http://nineslash.com/user_file/file/nenexalefiwaxe.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/48059038919.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/23859297043.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/71373456786.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210906202205.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/3829258347.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161328c925968e---41425002185.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/30867467395.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/38979205965.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/9416901227.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/63798192260.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_off0000b3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C6 10360 bytes
SHA-256: 26da2394cbb4b445fd3a6486ea84a4b11b3d3cec2c8ceb066abfbdcca81e551c
font_01_sfnt_off0000cb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 16308 bytes
SHA-256: eefbf8236a26ef915f09f9b4e80286a787215184fdd1eeb07fe50611ed91a1a1

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