Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c13d6210aea26cd…

MALICIOUS

PDF

100.4 KB Created: 2021-10-06 10:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d61e9ee46fd34981b8cd6d4626c3275f SHA-1: 9d361a9030cf8572fb5776a927a32f0b87f846ba SHA-256: 0c13d6210aea26cde11d134dca9add2290b720c62b5601f4a1d676237f57fc15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a link farm technique, where numerous distinct hosts point to PDF files, suggests an attempt to obscure the true destination or to distribute malicious content. While no scripts were directly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://volareinmongolfiera.it/userfiles/files/61367880272.pdf In PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/pebudulipiwate.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/64113653535.pdfIn PDF document text
    • https://parfumzone.ro/files/file/kekuder.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/54274443344.pdfIn PDF document text
    • https://latework.cz/soubory/baruvevuwufiniledore.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/xakebitomirixikokabi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4af910d09---97570669957.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/fugokanit.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109230220062224.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/gedegizusifufafo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615600284587e---70080474865.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/61766806078.pdfIn PDF document text
    • http://machulski.com/public/file/vutamapejanilumodomawa.pdfIn PDF document text
    • https://baldai.manovonia.lt/images/files/gunozozojaguwilunela.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/relovexurowulozutiwen.pdfIn PDF document text
    • https://tuinvandecruys.be/file/dukome.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/14765389988.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/vedunixax.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/98794988988.pdfIn PDF document text
    • http://mariancozma.com/_user/file/40629855225.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1490128804613baec208c94.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/99396300136.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/5956490838.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20211005070401376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+piper+pink+floydPDF 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_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 19960 bytes
SHA-256: df0418fa1b6e7a98cc81fe0022b981d53073fb507d49d5aec4a3129b1399b6c2
font_01_sfnt_off000154c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDC 10336 bytes
SHA-256: 968a590eaa25f9bfcc4f278ec030b8fff4f9667877cf183868e47ff592d0b97c