Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9a042c146c8bc2…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 06:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 857ca3f2acbfd9672a75f5f450821ef0 SHA-1: e3a661cc75da2aadb7a2304e56166dbca9cf1df1 SHA-256: cb9a042c146c8bc22260f37ee9e8395b7ab1225b6c566eb9bacd6ec9cf62194f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and heuristics point towards the file acting as a lure to external, untrusted resources.

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://tcremich.lu/files/files/duxixugaludavisidowa.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356b849a59a---21867431890.pdf
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/32695613126.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/66154294144.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/kipazajevibulovatuleme.pdf
    • http://ldkxzzs.com/images/userfiles/file/rebanarelitopofexeru.pdf
    • https://rainbowprinter.com/app/webroot/files/file/58645153514.pdf
    • http://hajnysport.cz/FCK_userfiles/file/82534732072.pdf
    • https://bolahijau.com/contents/files/rojobo.pdf
    • http://ensky-chemical.com/upload/files/kesozaxufoxuj.pdf
    • https://listocrm.com/userfiles/files/75261153724.pdf
    • http://skomi.ru/img/files/file/74381613140.pdf
    • http://envigest.cz/upload/file/pulujirukupugarotawi.pdf
    • http://dhleisure.com/ckupload/files/lanedufunetaranuwisetinas.pdf
    • http://9275522-travel.com/userfiles/file/58784017038.pdf
    • http://studiogalata.it/userfiles/files/xurikowoxolevoza.pdf
    • https://tsolisp.com/files/file/bififogodamemogukefar.pdf
    • http://jsqnchem.com/upload/files/latadetaresafusep.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/matakukir.pdf
    • http://giasuthienphuc.com/Images_upload/files/zifeninapefiwagedu.pdf
    • http://bogaarchitetti.it/userfiles/files/981467351.pdf
    • http://vetsnab32.ru/userfiles/file/35897151619.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149b7a2051bd---62524436011.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+connect+your+ps4+controller+to+your+tablet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e2.bin
ccf040608c5821b5302d30996e85e425843a50ae803b2c398860a5a538162a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 14712 bytes
font_01_sfnt_off0000d6f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 16792 bytes
font_02_sfnt_off0000ef09.bin
eae3c7796527408979709efcb3cd166569e19cb1d424a6f494452d309945e63d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 10784 bytes

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