Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b9072ff7b73c1a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 02:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c771b6d65493d0e469c44b82d90c045 SHA-1: 1946577b467508230fd4fd6eb74897e687dc223a SHA-256: 25b9072ff7b73c1a0a7112d7cca10e5a2126ceb12105372d04d52a5a4dbe4c62
124 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious intent through a large number of links on low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

Heuristics 4

  • 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
  • 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://pololanna.com/user_img/files/14552485068.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0be637d8---51963717557.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/bumadabafudadojir.pdfIn PDF document text
    • http://newworldss.com/uploads/file/pajolumiziv.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gigopatejitagi.pdfIn PDF document text
    • https://mangallagn.com/images/file/22340070393.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/5957283294.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/morazapomuzerewolapix.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/34590744002.pdfIn PDF document text
    • https://rinducm1.com/contents/files/58875023969.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/jorebomufatufeli.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79257205278.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/2050022944.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c5aecf65---rupezexazufuzovepobigurat.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210919_089417B871CB4ADE.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/pogur.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/rajolapudi.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/68032965855.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/vojumujuzupasonewogeduf.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/7398518229.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/lalorematituxupazevik.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/mefij.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/499954006.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/sevilusizumulivumoriposi.pdfIn PDF document text
    • http://change4best.ru/upload/file/jusafekis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sky+cloud+app+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 17792 bytes
SHA-256: f209dbc526ba8bab78bee0678ff78537433ea4ac3cccb46269e1579687b8673d

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