Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63bf8db7ffa78a8…

MALICIOUS

PDF

67.5 KB Created: 2022-06-05 19:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 62e10135df450d598d78cd11ca709710 SHA-1: 7e3d64614320e9caea478174e951bb50fc8214a8 SHA-256: b63bf8db7ffa78a8437d6c99c5b1193970bfe3db2d53f57e8b222f97ebd22e1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or a lure to phishing/malware sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for such links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://sunuf.co.za/YmrXLWy8?keyword=introduccion%20al%20diagnostico%20por%20imagen%20smith%20pdf%20online%20gratis%20en PDF link annotation
    • http://machulski.com/public/file/viwenoxuvuro.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/88847455172.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/68109627167.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/sabobene.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/wofotajudolaki.pdfIn PDF document text
    • https://wuxulekagapus.weebly.com/uploads/1/4/1/6/141626355/5303157.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/19374900351.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/87854401750.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/bemibodiroweti.pdfIn PDF document text
    • https://hoongnau.com/upload/files/fixozuvirefak.pdfIn PDF document text
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/5dd68977a18a7.pdfIn PDF document text
    • https://wenojuzak.weebly.com/uploads/1/3/4/2/134265903/muguzujumeza.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1623464104bd5c---baxetabin.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/54356729244.pdfIn PDF document text
    • http://travelsolutions.co/ckeditor/kcfinder/upload/files/23691359097.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/tobajidotalaku.pdfIn PDF document text
    • http://grafittipng.com/userfiles/files/85862989446.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/telomabodegunazesutozegu.pdfIn PDF document text
    • https://baptistfriends.org/media/30894904484.pdfIn PDF document text
    • https://vakakarixo.weebly.com/uploads/1/3/4/5/134590502/derafagaso-nafog.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0AB 17044 bytes
SHA-256: 78d631b23a6cd41f2823c2a598298234ed5cf133142518cf0a8558e6dbf2eeff
font_01_sfnt_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 11120 bytes
SHA-256: e479afa9707eafc26be43df686d05f11fcedb44212158a32a79423f4f10e7630
font_02_sfnt_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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