Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9381d4f83ed5b3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 18:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee5b0bcd2269cce9b4c16f10d9b5f096 SHA-1: 9c7103e0b96da9bd4f87a6d4161120d0752209c4 SHA-256: 8b9381d4f83ed5b31df19274e8767b8c75d19cbe0ce9d0fea8d65e3787abfa48
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, including one that appears to be a redirector for app-related search terms, suggesting a phishing or malware distribution lure. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=apps+free+on+android+but+not+on+iphone PDF link annotation
    • https://alharithiforcameras.com/ckfinder/userfiles/files/57972025405.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/veguxitepotasemurenije.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/r06fae09rsuh7mc23gmkjcfauc/ganuba.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/nojatem.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/46970608378.pdfIn PDF document text
    • http://cy2hand.com/userfiles/goduzuwevuxef.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/1628620840.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/68591012936.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/83103219600.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/felaxujezir.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/nizigave.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/55609663348.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/rifababaritiba.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/41491335761.pdfIn PDF document text
    • https://kratky.eu/files/file/18588400799.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/sifozixubobunemunobikapuw.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/42851364136.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8dab1ddc1ea5f1b0e2a203caee41c44f/vuvasatorupokofafit.pdfIn PDF document text
    • http://renknh.com/ckupload/files/wewijekobivitole.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/88552966222.pdfIn PDF document text
    • http://pk.mo/userfiles/file/wowoxuxaxese.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/nugazabefovuwikerep.pdfIn PDF document text
    • 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_off0000cd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 10768 bytes
SHA-256: acdeeb2ca2a021ad94355c0a5a5873275681eb881aa519b369f9f827e85ddae8
font_02_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 17628 bytes
SHA-256: b9f2d6fb1a783574fa2a4978bed189e3e77d08b41034bfa5f064b8762d6d4e1c

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