Malicious PDF — malware analysis report

Static analysis result for SHA-256 583cf2c2f1e2c1de…

MALICIOUS

PDF

79.2 KB Created: 2021-10-05 01:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ebc19e3d3ac8d18ba988bfdd375efbbf SHA-1: 4f5f0f86f40a91bb5146d3f0ec39d9aa2253b48c SHA-256: 583cf2c2f1e2c1deba4784940ed88d8be461963b8e20cd22f2190f9fc2020bd0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files, indicating a link farm or distribution mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts associated with these links strongly suggest a malicious intent, likely for SEO manipulation or to serve further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://secondary.oksalesstore.com/uploads/assets/files/46199518896.pdf In PDF document text
    • http://pascalparrot.com/uploads/assets/file/78817288044.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/37633596007.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/4436211746.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/3723661087.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/mizebabe.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/tatoxe.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/90213541773.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/80696847797.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210921204525.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/11771916142.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/97249832947.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mmsck10s05bvsajf0bpdv2sno5/wegikozomejiperan.pdfIn PDF document text
    • https://jetaime-shop.com/files/nedesomele.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/81003594125.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/58424382938.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/givilagexetejakavam.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/waguturobewet.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210926204216.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/xexokigagifavawe.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/fibezutuwisigu.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/4554279499.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161434f133d026---netafujozapipubetufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=doubt+meaning+in+gujaratiPDF 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_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 10608 bytes
SHA-256: d235e7bad2c3d3406fc5d261d45f448affd117ce914d19f58fa9b344acf93bf7
font_01_sfnt_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 20972 bytes
SHA-256: a58e8e644842cb3eefbf877b81d8a9e37d9421cba65c02d474084c3759f88fcd
font_02_sfnt_off000117e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1