Malicious PDF — malware analysis report

Static analysis result for SHA-256 5441b7f124d26eb7…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 04:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcc88110758f824367af9a1e2e008f91 SHA-1: 178b694d5b7609a3992b8d9fde9187504b3ce938 SHA-256: 5441b7f124d26eb7d684145a37a1736d9061838447713ca2266cd3b6e1575d4a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI heuristic and the numerous unknown URLs extracted, which are often used for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd188815b6---kenejuwakezirudi.pdf In PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/viwinitegeloga.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/1408650927.pdfIn PDF document text
    • http://herve-coiffure.ci/files/xikudofurexowinumo.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/kefusegurepejunarurop.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/xaxuxes.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/moruwilalopov.pdfIn PDF document text
    • http://rts-3.ru/upload/files/50300297699.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/84407698276.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/12317022131.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/93582966380.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/96789031009.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/wosugo.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/gazisanu.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/xuworejefurogiza.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/nidolujofomaxabixozekopub.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109010644139383.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/kipodetaliwebegodi.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/xivizunazanikimamami.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/misiwagelatajotawaza.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zadefakesixavarap.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/26477354909.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xavoziwanagirumibero.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/82281726014.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/48231210524.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109140638558984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=american+horror+streamPDF 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_off0000bbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF7 10432 bytes
SHA-256: 734da135effa3d69378f6f37325f221c8f8f36e39aa2c8d8c36b90e1fd98a0c3
font_01_sfnt_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 16516 bytes
SHA-256: d498731f3bfab555aca070e675bcda121c40b7cc4d6fb550fe81036babcbaaec