Malicious PDF — malware analysis report

Static analysis result for SHA-256 56349f79488dc653…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 08:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fc28360a46be90be0678482524a8642 SHA-1: f772e2e7f3fde9da16dcd9d16222d5599e08a11d SHA-256: 56349f79488dc653ff971b757c16a2f174abbcbb858c58398658782ae2de2107
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=what+is+whatsdelete+app
    • https://by-express.com/upfiles/editor/files/xowawodezubemo.pdf
    • http://zhongjiukeji.com/upload_fck/file/2021-9-8/20210908032829324719.pdf
    • http://tdsns.ru/userfiles/file/mojexijabazawewabiguz.pdf
    • https://onutglen.com/caningest/images/file/zumike.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/zotemowanosupuwisogoni.pdf
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/retitoxebawemokuzoxo.pdf
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/ferelobito.pdf
    • https://szabobuszrendeles.hu/files/files/3968833235.pdf
    • https://get-insurance.in/ckfinder/userfiles/files/8801705364.pdf
    • http://gazomotor.com/allinone/file/gexodowodikefibiwiva.pdf
    • https://stpm-sa.com/userfiles/file/fobabiluwekuzibalevokapi.pdf
    • https://atputasbazes.lv/images/userfiles/files/33287937865.pdf
    • http://sgd42.ru/userfiles/file/81042559361.pdf
    • https://fond.ru/userfiles/file/jenuj.pdf
    • https://woft-dining.com/webroot/editor-uploads/files/61157379544.pdf
    • https://www.casestilistas.es/ckfinder/userfiles/files/22117839854.pdf
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/10927058122.pdf
    • https://gdaniec.com/upload/files/mojonijagiragudexajo.pdf
    • http://esen-life.com/userfiles/file/zasuwijamavelasixupakuk.pdf
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/25266066528.pdf
    • http://playonathletics.com/userfiles/file/17352593753.pdf
    • https://digireg.org/upload/jeluzikobevimuxa.pdf
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/butupezamo.pdf
    • http://xmzhj.com/UserFiles/file/85035002881.pdf
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/48757348745.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_off0000e067.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 16792 bytes
font_01_sfnt_off0000f879.bin
04abba023ceee8a305dd0a17ebfce99d3fede6abd7b32ae282d58c534ab96a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 18600 bytes
font_02_sfnt_off0001279a.bin
d8cf322337f864c42f14674cf2cde2ad4bcf5f09ca9b8c6c9fce2ca988d02a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 10244 bytes

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