Malicious PDF — malware analysis report

Static analysis result for SHA-256 a744d0ec0229c93f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 21:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 50b19b33396af2b8d0d644ad6eb46e9a SHA-1: 59f6e9d31d34eafee08643b302fdc6402546afe4 SHA-256: a744d0ec0229c93f45d5b32a4a3d548b22cb0743909bef43056624dbb9fd010c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs pointing to disposable domains, suggesting a link farm or redirection mechanism to deliver malicious content. While no scripts were explicitly extracted, the PDF structure and external links indicate an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=label+nonfiction+text+features PDF link annotation
    • https://securitydm.com/slicice/file/menuzaj.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/60850311144.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/67712910021.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/69759719214.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/58168168163.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd32c027c0---sifamif.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/91927117969.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/77131828937.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/muxejujunenebenogod.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/purefamorajenes.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/kukunoniredaximat.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/44075975257.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/74205297376.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/69628299148.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/63149900567.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/58600173892.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/bikovi.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/dodobukekirukilejazivupu.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/51308017552.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/pigar.pdfIn PDF document text
    • http://rnralpha.cz/res/file/94762829159.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/rajofojofofolig.pdfIn PDF document text
    • https://viettrungson.com/media/Files/tekumudabo.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_off0000cc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 18040 bytes
SHA-256: 324c3f7e53018f9892212c72b333b4b7d6c0ccf068f2ebda573f9b9a220ff9cd
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 10628 bytes
SHA-256: 8613b645f7bf348a7d48cb98e8aa3d640e661738b2582dce3088f9bf809acda8
font_02_sfnt_off000112c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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