Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a565c6f3936219e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 00:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 984627726523b4c1422b9ad22fbc53f7 SHA-1: abab5e3d0dcec7de4e940952b474bdad3cca4078 SHA-256: 6a565c6f3936219e7d3ca2da293aa9108a97bd8b55fb8282de594b87d435c8c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b1e322eb---19182025148.pdf In PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/milasepigib.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/57547186111.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/nisibu.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/27808938500.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/15051051533.pdfIn PDF document text
    • http://imi.vc/upload/files/fuwatulojorifavubazusised.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/62801900892.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/jezesobekitojawopewimefil.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210918193808.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/simesomojikefupe.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/97190038123.pdfIn PDF document text
    • http://jinyezi.cn/upload/51405059940.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/95389428206.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/23552191375.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/zetuv.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/89397180039.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/bugekusewojurinefiza.pdfIn PDF document text
    • http://only-svet.ru/upload/files/47971947492.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/57936083904.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/26959185176.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/94683433277.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/bizomuw.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/gemidokuwukomaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ramayan+book+pdf+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_off0000af13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72A 11116 bytes
SHA-256: 6827e3ffc5ae7538c972be7f033cf554b3dab8a2ac28a8a70a64465b2f5cdaa5
font_02_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 15736 bytes
SHA-256: 5d9a99147e5dcb4c12e7c89b04257f813e5f4c9b419bb2c84b67ef2ccb157490

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