Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9deede56a0ec44e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 22:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c31451b7a6bf1361612414ec4e926bf SHA-1: 84b6262e681746b6a0b1f7589346b540a12e382f SHA-256: d9deede56a0ec44ebb79f1c18a5859d6eb52e339a3244be2b1bf643d525ee24e
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior, and the presence of external URIs further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bhandarisurgical.com/ckfinder/userfiles/files/kodosikikosejob.pdf In PDF document text
    • http://lnshiyue.com/userfiles/file/20210925090144_1343872123.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/31261576969.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/gitonorepe.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/fozezawabamuw.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zibogokutepug.pdfIn PDF document text
    • http://jawarakreasi.com/file/wufuxubefuwo.pdfIn PDF document text
    • http://centronegozi.com/public/55441244371.pdfIn PDF document text
    • https://limsurdua.com/contents/files/58745914844.pdfIn PDF document text
    • http://machulski.com/public/file/jejipidunilotirofovisaja.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/nobema.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/50207758093.pdfIn PDF document text
    • http://doxetrilinh.com/media/ftp/file/karoteduzowifumeg.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210925_6A3B9092931D874D.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/tivogovup.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/babeniburokajesanosex.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/42477000036.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/16151728039.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/parifenuna.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/vevakibobug.pdfIn PDF document text
    • http://sissonne.hu/editor_up/zazesirobag.pdfIn PDF document text
    • https://airbays.com/userfiles/file/baganuweradi.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/fetozo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e7358b009---78913380822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=biology+campbell+10th+edition+pdfPDF 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_off0000b013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB013 14788 bytes
SHA-256: a41d5c253d4d99dabbc3f91511ae372058ba5b17a59187496b885a02f9ce6711
font_01_sfnt_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 11280 bytes
SHA-256: 12839e80fd1b2da0098203e42fb64917f2661fe706f9d30a3ba8e96f33d65103

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