Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcbc7cd65547170…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 17:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 761cd79ffbcb207e3dc0337159a20ccc SHA-1: e1b5ec65e204d874edb141c068191559099f95c0 SHA-256: 7fcbc7cd65547170221ad2f30838f0e729234e3b02445661042cd0b3b6364af9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=samsung+galaxy+a20s+custom+rom
    • https://bagstyle.uz/images/file/8967743728.pdf
    • http://konberdbio.com/upload/files/xarawagojiwe.pdf
    • http://demirlermetal.com/resimler/files/kanokuroregogivufuxoxiw.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/pemiwaxeb.pdf
    • http://premiercontainerlines.com/media/ftp/file/jaludamexumirerifajumi.pdf
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/zarujemikuloletumemokop.pdf
    • http://shrlie.com/upload_fck/file/2021-9-6/20210906080005855675.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/92015126623.pdf
    • http://heathrowairporttaxi.website/userfiles/file/39176018946.pdf
    • https://autopsrus.com/ckfinder/userfiles/files/23951416763.pdf
    • https://5703n1n6999-6a55.com/contents/files/97342542391.pdf
    • https://infotechsystemsonline.com/ital/www/img/file/91610580116.pdf
    • http://vitrine-prof.com/files/44448937491.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/38004082275.pdf
    • http://bortran.com/upload/image/file/20210913075238.pdf
    • http://fongyoskert.hu/userfiles/files/xobadukifujetofog.pdf
    • http://lexus-custom.com/js/upload/files/23261835959.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/balufezijamifulukifek.pdf
    • https://beauti-full.ru/uploads/files/wogosafotubufi.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/14851848086.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a007ecc6---94315212470.pdf
    • https://clubesolbra.com/uploads/files/wokaxe.pdf
    • http://tlumacz-bialystok.pl/pliki/file/benadewitemuxebexapitivos.pdf
    • http://kaus21.com/userData/board/file/zazimumenuxotazuseso.pdf
    • http://teamtrinity.net/trinitya/file/59683576066.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_off0000b159.bin
86e4dddbfa41502af19c2322fafaf66b073f34deb4a4fc5a89076e6457860679		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB159 17004 bytes
font_01_sfnt_off0000dcae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 16792 bytes
font_02_sfnt_off0000f4c5.bin
95f0cec41538da6fcc388f11d7d5414347b9346fac332fe72820ead506c181fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 10984 bytes

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