Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e7fced85730ea0…

MALICIOUS

PDF

69.5 KB Created: 2021-09-08 18:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5a08262ae8e85ab7147ae864b89a813 SHA-1: 1acc65e968c3fdee4ffee68f085a4e44c7c94919 SHA-256: 51e7fced85730ea0ca0f52b83668889248d94493bcbc9d39adaed40dcebe89ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external PDFs hosted on a variety of domains, many of which appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/69859787451.pdf In PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/bixawafunotazukexetoxujid.pdfIn PDF document text
    • https://reniuved.it/file/kusijejamonitonotixonaru.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/1608746307.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/80654367020.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/rexofejuf.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///88840067820.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/93252321606.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ak27r9p1s3qtt6ismsqh0j82qi/valapizabazugezudajufavur.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/tobadug.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/29836068735.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/xotikirokuzugiva.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/noberivuzoramisovi.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/kapexejamowidi.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/18931223446.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/rareloni.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161330ed0020ba---92308169796.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210901101708.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/acd815ac4da39eb464f0f48690596fb5/72914295181.pdfIn PDF document text
    • https://egca.fr/userfiles/file/dekif.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/56168849351.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/85473051682.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/vugemebozikujinisolig.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/bumazuwoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=a+profecia+celestina+livro+pdf+downloadPDF link annotation
    • 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_off0000b209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB209 10748 bytes
SHA-256: 03b8cd926a347e64f87118c4ea15ab3377bf2ae5f961552f1d974d0a63231482
font_01_sfnt_off0000caee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEE 14740 bytes
SHA-256: 63b3de613d8e23e4e5fd225a0c096d0f5d9d79db77d30b134f8b4a540f8e3c3f
font_02_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1