Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d73fb975c313889…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 11:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05fc76906e6ce74da2eccce21783158b SHA-1: 9e8248db0b225a4ef36d51278ee8a372852909b1 SHA-256: 2d73fb975c3138897e2ac9d38541a7c7352fbc4f92013c578e471e3c29c094d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it functions as a link farm directing users to external URLs. The presence of numerous URLs, many with UTM parameters, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=extreme+speed+car+simulator PDF link annotation
    • http://talcmanagement.com/uploaded_files/userfiles/files/segonorakedavajedavolife.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/nisuden.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/depagaw.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/59839227605.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/69632541845.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614518ed87f4e---fogaviwamup.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/ralovewozuf.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jevigadobigerubikud.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/dasasad.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/46850325318.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/rabolewapupewowopolowavat.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/tuxumedonoraneti.pdfIn PDF document text
    • http://emannsltd.com/userfiles/55881198285.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/lumixoroxefidalowerenutob.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/40767165643.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/nosisenos.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/41143477360.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/nigexovub.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/karivix.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/foxedewem.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/detexu.pdfIn PDF document text
    • http://djapm.com/userfiles/file/46052960774.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/80590324124.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/2075501243.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_off0000c27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 10756 bytes
SHA-256: 08ae3bd5fcf82e40c3690df892fd561d69b7f208d67fcbe155224859871c2649
font_02_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 17584 bytes
SHA-256: b46f01851a5c9e580a7f797a25dd13cd8f2c522bfd97407cf0365bf464540545

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