Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bb5efa80e07e1c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 08:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 206504a9c342a362ae2dc24efa880e9f SHA-1: 2b0363ce53acb6c7a073225d454223329856d68b SHA-256: c0bb5efa80e07e1c424fcff03abc37a409f1e593e7713f67995cc892469d991e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. One such URL, http://a-pluset.com/userfiles/61937360857.pdf, is directly associated with the malicious detection. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://a-pluset.com/userfiles/61937360857.pdf In PDF document text
    • https://associazionebriciole.it/public/file/46872824439.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/58373965454.pdfIn PDF document text
    • http://rubensova16.cz/files/file/magilepemawakediralijag.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/kotivajemokob.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/34637446452.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/25859061014.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210910011649.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/43160579418.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/wovaraf.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc6f21165---ziriguwem.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/20595325446.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/putisasosekuxilefo.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/47303293202.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/bavixovinuxigup.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630713287/files/bevekepikisalawovorebapu.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/10997683502.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/27174741293.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/5492495622.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7a88b6126fb7d677e95ca4fea635f49a/jekifidivexabexukuxibava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=nova+iptv+appPDF 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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 20596 bytes
SHA-256: 912959f7d28a66553be10e656f0df263c2eafbbb66ab48cf1d89aeb3bc5a8f14
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 9736 bytes
SHA-256: 7f61ce0bb6ce2c299657da6a1cc03e8f2a13b6b02a0d8cce10b36f09a6d54548
font_02_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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