Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be2d990eda79ef3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-10 11:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c438bb6bbfc556c4f36f70b8b990c91a SHA-1: 5e9d260db9611a57e03fb97a55fe5c9b3d300c7f SHA-256: 6be2d990eda79ef34dc42d86ca534b40f6f123cce08470e0a7a1851ba0e8d9f1
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, suggesting it's designed to redirect users to potentially harmful sites. The presence of multiple unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://foundationkuzmanov.com/files/22973995532.pdf In PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210909_97A8A3B1A5A11A7C.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/resoxuzadofoweweki.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/30861278810.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/xovemorimolaboluru.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/13280355317.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/99219946707.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/satenabigikaxufosu.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/fuxulufudatoselow.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/kofapoxovogewagup.pdfIn PDF document text
    • http://marjoyunlar.com/calisma2/files/uploads/84102670891.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/senexinanerewizevu.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/16222397823.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/rabali.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613686ba84be0---nosirobakuzetilijufoxoze.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/weraxifeworunejekido.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/83552094184.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/dubaxukiwurukote.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/namipitokexasolenifadagi.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/7095250440.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/kuzopufazud.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/65344761181.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/desoduwurukiduxowawiw.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/kisutapogugutilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rozdhan+app+download+apkPDF 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_off0000c20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20B 16880 bytes
SHA-256: 575525c607eb3a40c8fe869cdbd41091cd34910795e7dcb4cd9ff9b46c820998
font_01_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 10180 bytes
SHA-256: da4d1dfc92775bcef266bba710ab42208cc43058bfee5dd72050d6fe1241c1cb