Malicious PDF — malware analysis report

Static analysis result for SHA-256 033dfa9c9eb8a7e4…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 11:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 034866944e120270515d04a0672de7c8 SHA-1: ef2784cb99da9f08f92654276f53610454228bdd SHA-256: 033dfa9c9eb8a7e42fd0ded468d1c53257d1e1378c0af52d29d27620d59b0565
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting it acts as a lure or redirector. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://turskazka.ru/ckfinder/userfiles/files/jekes.pdf In PDF document text
    • http://ohdiabo.net/images/ckeditor/files/wuwavumamezax.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/bizewibukivisonafedezume.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/54786060133.pdfIn PDF document text
    • http://cartopack.be/Images/file/wafuriwelikonigafaxuwokud.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/sufuvelesegaka.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/zixoliguza.pdfIn PDF document text
    • http://retailcop.ca/files/86647775875.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/47098247568.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/afd5b6e308f29d5cdc9879ec89266e6e/12241012784.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/tilajodolew.pdfIn PDF document text
    • http://newshop.jp/archive/file/pulodunexafiri.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/19961422806.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/89803749516.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/52904569354.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/78227595400.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/16064562822.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/92401114684.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/ginirudosotose.pdfIn PDF document text
    • https://thietbigas.net/media/files/45220596516.pdfIn PDF document text
    • https://desco.scp.hr/files/fuxale.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1da1ad9c---74097368806.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/90850412823.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/begefabovejox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sears+and+salinger+thermodynamics+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_off0000b0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F7 14304 bytes
SHA-256: 2770c46ca85baa98f6ec6b5c2def58b112ef946f9671297c99ad7d0e43ebbc99
font_01_sfnt_off0000d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 11256 bytes
SHA-256: f5edd3662a77ecc5892882ba43e11ed62976ad6dc26b336e449fdebb5930529b

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