Malicious PDF — malware analysis report

Static analysis result for SHA-256 4895517cdb8e876f…

MALICIOUS

PDF

74.5 KB Created: 2021-09-15 22:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45a8383bea03bb0d99e3e3dd7fb77f33 SHA-1: 210351164f92f4498f6a9012b5d57def05c70c5e SHA-256: 4895517cdb8e876f9b9a6c4a345a754534c1bf1906e41999f6ac3247675c8357
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a link farm, suggesting it's used to redirect users to potentially harmful content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'SE_DOWNLOAD_BUTTON' further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=best+free+data+recovery+app+for+android PDF link annotation
    • http://didaconcept.com/admin/fckeditor/file/90708988174.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/nonudoribovapunelugefa.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/zibuwopejudasibelimenunid.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/16197292515.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/saxapamaxomafovubew.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/94312465729.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/mokodamakebipe.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be37ce2fe---sitipuwekuluwusoza.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109071949343863.pdfIn PDF document text
    • https://diphong.com/uploads/zikatimegudefunid.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/89256198170.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/xokimagenefina.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/730217501.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/tekenugajubol.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dipalezinu.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/1218059474.pdfIn PDF document text
    • http://4darchitecture.org/img/all/49495800802.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/41000969772.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/82261765315.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/volufaxitipefegoxik.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/54970450674.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_off0000c078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC078 16772 bytes
SHA-256: 7e4829c5e27bd05054bfbade2b703f4d494bf644f1b1cd126f8e6bf6aed17a83
font_01_sfnt_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10800 bytes
SHA-256: 1a48d41bea0037856a770aafc6f74428a494c9c4ae93c6ede8ee4057c17c7a9f

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