Malicious PDF — malware analysis report

Static analysis result for SHA-256 30e86d1a23c249ad…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 04:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26e5193a9cc87c6dcf4f4ad211c58bb9 SHA-1: 3db29bc1d7ee0542673ed8c610cca473407122a4 SHA-256: 30e86d1a23c249ad3ac7f7bc244303700a6776a884dfdf3ef7f2154ba39c4c48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs that point to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

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 https://archism.ru/uplcv?utm_term=led+tv+for+sale+in+faisalabad
    • http://tai-group.com/upload/files/pufegogav.pdf
    • http://gd-weimi.com/upfolder/e/files/20210908115434.pdf
    • http://www.enfersalus.com/ckfinder/userfiles/files/jubepevirujodogetolopuvaz.pdf
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/fezowidivupavajisu.pdf
    • http://stringquartet.biz/web/images/fck/file/xozasobomobatug.pdf
    • http://unseretochter.ch/images/file/61424975343.pdf
    • http://perlawarmii.pl/userfiles/file/setovarazepumom.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/32333653152.pdf
    • http://ambvetesopo.eu/userfiles/files/xanunipaderunidumad.pdf
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/69800810153.pdf
    • https://lekkermooi.nl/userfiles/file/18199243759.pdf
    • http://baldonimarcostudio.eu/userfiles/files/xofomujepabek.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16144b1384528c---lonukofefitiwawujati.pdf
    • https://dejavuruse.com/userfiles/file/buxoripetikiwujajowes.pdf
    • https://coonvalleycc.com/userfiles/file/14559304845.pdf
    • http://parilka.by/var/upload/file/58305861322.pdf
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/78641519424.pdf
    • http://maysoi.com/hinhanh_fckeditor/file/zajonetivof.pdf
    • http://digitalqwerty.com/ckfinder/userfiles/files/64486862909.pdf
    • https://stiff.pl/ckfinder/userfiles/files/giredegutegevowodiloguxuf.pdf
    • https://amt-alarmy.pl/userfiles/file/30020622644.pdf
    • https://locktactyuma.com/userfiles/file/gomepi.pdf
    • http://zabradli-znerezu.cz/userfiles/file/jazukudagepudegalabum.pdf
    • https://keongracun.org/contents/files/fegazikufexilovafobube.pdf
    • 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_off0000bd9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9E 16792 bytes
font_01_sfnt_off0000d5b0.bin
c907401413299e99229232e72cfad2ec4d6ba1117c45fd85c4ef7132f5448552		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 17408 bytes
font_02_sfnt_off00010321.bin
fdaea00bec7f675ba627e9dad9cee3bda9175480ec91c3100ffc915cde5bdf41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 10512 bytes

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