Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3df92ed895932c4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 17:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 955393367d1e6f64a3fb94c99302fd2b SHA-1: c285c77cd18aaaf0bb34ac8388972e68189a0253 SHA-256: c3df92ed895932c4108cae1b8b4c837889ac336bc1780cc5fcec3d7d5b2a1c82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, commonly seen in phishing or malware distribution campaigns. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bomando.bomsolar.com/uploadfiles/files/burade.pdf In PDF document text
    • http://metaglas.kr/userData/board/file/72701677752.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/niweve.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/81150248645.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/75087511010.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/kofefeminavare.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/54991313556.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/lodazaginoj.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/89582782502.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613041fee948b---lidazoxirajapaziko.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/vedumukitemumenazukutut.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/76148806037.pdfIn PDF document text
    • http://orlickachata.cz/files/files/88126524894.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/371361856137a26b894c1.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161449e0903712---19724004272.pdfIn PDF document text
    • http://knipia.com/userfiles/file/walanotiw.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57610835220.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/51514561571.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/boparerowaji.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/wabulomadiruzobijese.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/poxatejivuwasa.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/tobobutiboxo.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/getosetokirisepokebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=choices+hack+diamondsPDF 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_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 10516 bytes
SHA-256: a8fa2aff60c2537734f23318da99ec53b21249c54672bc75b9963012278f6759
font_02_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 18488 bytes
SHA-256: 92ec3b3433d66b48a5fa1013f7fad00800d0b17c0979da605941d21ee69d405e

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