Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4ef01efd0f8452…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 23:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8ffed7a214373a81970bbbf928e3753 SHA-1: 34b34508d0e704521c6b179832447b78bd730ca4 SHA-256: bb4ef01efd0f84527a07f640d902fa97ed4518ebd192e6e8831e358f17690c90
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via a spearphishing attachment. The embedded JavaScript is the primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/figubudo.pdf In PDF document text
    • http://huspanda.com/data/ckfinder/files/15147748380.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/jasukutij.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/kibekam.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/46793072441.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/norowu.pdfIn PDF document text
    • https://stauber.lt/images/files/36332516452.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/79407686147.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/sugidafuwemuzepup.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/zazalitan.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/13356545345.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/geremonupoponomegesem.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2ef882db8e40ad2d9e9821b368d45403/77630829203.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/040233316182.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/29844498179.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/30889341047.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/texin.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/paboxomugodotol.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/fusanupozix.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/pizovapi.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/digepevatutidi.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/dugekudabi.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/98682251846.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/99081173263.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/11840896245.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/26165716322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+hairstyles+for+skinny+facesPDF 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_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 15820 bytes
SHA-256: d8cc2f973647bcae7b00d44fd4d8867e7b2b3eec04d6a3ed5dca241ce9f2c606
font_01_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 10692 bytes
SHA-256: c559b2d697e2d640a43aad6334caa3e3192c4e6e8ead12fc36dc78ca1e42165f