Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ebe29e996c8215…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 09:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d754e6735cd8b1628ec53551e331bcff SHA-1: 4bcf3a33292030ef2cb3eee379e0e10c7307d0db SHA-256: 58ebe29e996c8215b42215d3840707bd37afbb73e5b6585e96fd3498fda9d6dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, identified as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nifaelectronics.com/userfiles/file/jawejonajutinotilevif.pdf In PDF document text
    • http://tw-sincere.com/upfiles/editor/files/jinodedegumetuluwav.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/89202796607.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/jeduxopasanigukeran.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/58597826938.pdfIn PDF document text
    • http://keitbg.com/images/files/45471215203.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/dakaganuzewikedim.pdfIn PDF document text
    • http://allier-genealogie.org/File:/sotarefix.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/59834234799.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/23671316375.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/vokoxanulifebezuzobilu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/rojugu.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210913_592CDC08812EB18B.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/lakosusimikejit.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/59307139848.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55a6ae513---47909606012.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/futunosusekugesofadub.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/biwuzizufuge.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/67737062438.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/zegina.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/tosejolitimif.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/54883949765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+novel+william+risa+saraswati+pdfPDF 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_off0000d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 10812 bytes
SHA-256: 4c0d08177e51b9b099675d03814af30ff105fb188df5bf0e742406c03bb23e6e
font_01_sfnt_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 17452 bytes
SHA-256: 48e1b2f7a61b1e1eb3a918df7b0042538b169e1d18301454cb82562b9a05d5c3
font_02_sfnt_off0001161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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