Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bae86f1cc95675…

MALICIOUS

PDF

70.4 KB Created: 2021-09-19 19:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32bf3db2e910caf01d8ebf20c730fcde SHA-1: b3731f0e7f00a8ddca548f56bdbc35359fa2e9e2 SHA-256: 74bae86f1cc956759dd3782b9b41a23da3f026822fe40004fd7670984a465001
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the PDF is used to manipulate search engine results or distribute further malicious content.

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://wittlich-luexem.de/userfiles/file/gobiz.pdf In PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/54672640487.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380aa7b6df7---kezurogewekaforibovev.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/jiwivomaxene.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/zofolikupozedexupoweko.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/12132093454.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/61133809525.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/duguxilukifugigusida.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/92012878231.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/lalelagakem.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/97099783710.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/mugirajekupo.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/79116307509.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/kokugodonikiwexomen.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/bogobo.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/dosuxomusovavajowiseluguz.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/52005278510.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/vojatovoj.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/10675148115.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///gasoxuxibudoz.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/75047657790.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/givojiposena.pdfIn PDF document text
    • https://endobible.com/userfiles/file/73965137248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chromecast+for+desktop+windows+10PDF 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_off0000b44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44F 11220 bytes
SHA-256: bec21d1682491866c6472b5f763284712c81c56ad64a149b5bcff57d5ca7e7ed
font_01_sfnt_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 14900 bytes
SHA-256: d16112e68af78c8df8012bc142ebb92346d2bad49f6c149d1857845f9b602bd5
font_02_sfnt_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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