Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9fc09527ed8ae4…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 03:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a487c6eedc5147b60f7014824f6690d1 SHA-1: 9bdd978ddeebbd57a1d24de91d0de423a5a3d255 SHA-256: be9fc09527ed8ae4c85f24b93ba46ca933b90bb423c5cf4adbc96964a004a7be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it's designed to redirect users to external sites, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=how+to+block+unknown+numbers+android PDF link annotation
    • http://ayrh.internet-match.com/upload/files/furebodakofaragabodar.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/karaxa.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/mafekosegojuz.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/poxakefod.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/43517889027.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/57358712712.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/wubasuxoxajogawupumoxo.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/lerufaboki.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/94954339959.pdfIn PDF document text
    • https://plasy.com/uploads/file/soramimugata.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/mivibaf.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/sekazudarugufexuxun.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/98072999344.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392362f0e61---tewaxabatuzemip.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/57369885178.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/95350673059.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/95099732871.pdfIn PDF document text
    • http://esteel.my/userfiles/file/90551103738.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/38401650711.pdfIn PDF document text
    • http://erpos.sk/data/files/dojis.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/85745354045.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/9840381705.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_off0000ad18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD18 10940 bytes
SHA-256: b7f34f8faa1d6cdaa50ef8c7ab3e5214053f992af8b34daf8a4c81607b5b5114
font_01_sfnt_off0000c67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 15304 bytes
SHA-256: 6390525de0b601952cebc3b3078a77c7577ce645e0c17981f9f7c8e8d701873a

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