Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bc74a3c8adff86…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 09:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5b706335628a8b44eac3909921a04ade SHA-1: 05c10b43d54e3dd18618d500705c88feb6158ab6 SHA-256: 53bc74a3c8adff86466a58eaec6c01a29524a34f243d2c4d54c75c290575f7aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://boxshop.mn/userfiles/files/91200472647.pdf In PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/66852527992.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/sujijawejiwi.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/nopogogilikixagof.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/zokozobefizejigogeriwemuw.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/59007669385.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/fobifunilesola.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/rizoropanexutixo.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/41023300103.pdfIn PDF document text
    • http://millecolori.it/images/file/kosewakujudinesadulitax.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/16749051702.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/76019617895.pdfIn PDF document text
    • http://aven.su/userfiles/file/vatofudiw.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/julolosukob.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/jatukaperif.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/tejanekapope.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/93165341451.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/suzivigupudusuvo.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/woperunibuwix.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/bibatazanugokinor.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/xubavimoguwewuzixurideto.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/83711673019.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/tosulogeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=debian+install+android+studioPDF 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_off0000cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 18336 bytes
SHA-256: 13c8c88354e7f04d4aec0e8b10e3c12009fc1b9393f1121ab35a153db625fc8c
font_02_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 10480 bytes
SHA-256: 3843eea2e5ccecb1333bcb3369d4243cc4ef12216a973612d864ffd19acdac4c

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