Malicious PDF — malware analysis report

Static analysis result for SHA-256 b714c54236d5b3d5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 21:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1747ed65f364df0f57565cbd7ad07b1a SHA-1: 3beff12b89c71a902f76b2d015abf755a6b3314f SHA-256: b714c54236d5b3d5f299d2e906c35112d39d5d042f6205a372328dd193b1654d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is a link farm designed to host many links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=twilight+movie+online+with+english+subtitles PDF link annotation
    • http://tantusmarina.com/UserFiles/file/68954597925.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/2467096104.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/wigojor.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/73549494271.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/8088087619.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/pujadewotuguxupurililab.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nedarosib.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/67198480516.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/93369060415.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/towaxavevejajowumirubabor.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/pasebikevulo.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/paduxu.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/8511244059.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/51447658532.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/79394141984.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///54268982584.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/wonorebigomowarusix.pdfIn PDF document text
    • https://ijp2.com/contents/files/repapuwapowuneve.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/71939864442.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/1926533205.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/68861983192.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/pamusojokavevevezitavow.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/15634146831.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/46883505141.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/towevotevuvatejenajebuwe.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 16920 bytes
SHA-256: 17cbe6f2205fa6b8552fed6674d8cce9e0551f2b41aeb5b0b4bf4b0a095ac44b
font_02_sfnt_off00012cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 10648 bytes
SHA-256: 5d3101184133817e1851e3da4289a179093b396894f0f20f84bc72ebb87d4818