Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7efc2170e1a7097…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 14:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05ab0bd8ea353acf553b1a4e8b217229 SHA-1: 23e8705f8fbd1b255efb037899ea09772eaa1bca SHA-256: d7efc2170e1a7097670bf414031bf515c0c216d6902226c6ef1e8520232cccb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the presence of multiple unknown URLs points towards a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wietsevoermans.nl/ckfinder/userfiles/files/tuvewevenarafisujuv.pdf In PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/rekovibesipimupatu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddaea8602c---reketo.pdfIn PDF document text
    • http://konberdbio.com/upload/files/kebigepapozuxowirobizugik.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/86136774856.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/besegigezamop.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/ziwareverazavavu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zawuxorelorixedifiji.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/87986029029.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/5929842852.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/gafutovisojijemanobeb.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-11/20210911121851363029.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/toxifebowujopu.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/xekusezubaf.pdfIn PDF document text
    • http://www.centralperdana.com/file/pogevagotagatufizax.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/34fd64aa4241465d6af03cc6f64bda6d/59012075811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+voip+freePDF 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_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 16684 bytes
SHA-256: e0ea9574a401941345ff00e0ac2647f4f9fb2b64bc12908ae1cff1b40dda2a19
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 10064 bytes
SHA-256: b709d868249d671cbddfdf4b5efd5a0e7b5e54a19b5b87fe1d38b5f1db77b1c3

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