Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3376855d3269267…

MALICIOUS

PDF

98.0 KB Created: 2021-09-19 08:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b08670492852b80aca908c39a31dd2cd SHA-1: 86973e7d69eeea2f30d01d2cfa79e4db5426a7a9 SHA-256: c3376855d326926763223c1121d0c53ac66462b559a2f5bda751924c9e0a2a70
126 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV flagging it as a phishing trojan. It contains numerous external URIs, suggesting a link farm or redirection mechanism to distribute malicious content. The presence of embedded URLs and the PDF structure indicate an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://oniceh.ru/uplcv?utm_term=fast+charging+software+for+android PDF link annotation
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zipab.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5504f43ef93bd729ffaef9a31f297504/wikaxibejewev.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d376fcba17801e4258431f2d989ccc0b/favunawiwekoveselutapafo.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/mowunexa.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/67958069640.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/57399856154.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091111511573499.pdfIn PDF document text
    • http://zerosquareonline.com/file/nurajoxa.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/80371161451.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/9627115235.pdfIn PDF document text
    • http://rotang.net/userfiles/file/40448464107.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/31021473260.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/gezewiximete.pdfIn PDF document text
    • https://j26clean.com/upload/files/82707210861.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/44570875248.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/rusegufetokiro.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/96731433257.pdfIn PDF document text
    • http://fohow77.ru/upload/file/91293105239.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/dedalifovun.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/69108691795.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labejiburu.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/mipemepetetuzejaz.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/difafu.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_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001341a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341A 10772 bytes
SHA-256: f027eb837dbfd0fcf14c1be7928234f357f9602c646078521215a090ee3768e9
font_02_sfnt_off00014cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB8 17680 bytes
SHA-256: 7e136d80320599901bfa23e31739d708470ebfe6c225796b00e63a6d3fbdba75