Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c2050191090cd6…

MALICIOUS

PDF

77.0 KB Created: 2021-09-22 19:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d345e19022a71fded002138803f56cd SHA-1: 4156f4a0b6318d387cbd4949b2946f9c6a886808 SHA-256: b1c2050191090cd6c428726455231fa52082ca95177b01edaa8d6af25b19da0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the document as a link farm on disposable hosting, designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=how+to+draw+an+arrow+in+pdf PDF link annotation
    • https://artgallery.devctn.com/ckfinder/userfiles/files/kexovozozuvo.pdfIn PDF document text
    • https://proia.bg/userfiles/file/61531396901.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/59475629623.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210910_F263CD2402A4025C.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/94152617460.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/924c96c516e60f1b6485b4353a5de319/3773995586.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/legur.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/23013957387.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210906_3BF0C837B54742DE.pdfIn PDF document text
    • http://plncse.hu/php_data/file/10129387752.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/sumiginasiponijazuwe.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/87255901784.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/78757092736.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/93304102751.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/lajij.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/dedazarafotezin.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/57479885258.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/jlimcun61i1fv3okn6n8dj5889/93775603872.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/samovejunutaxigegikopibib.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/subab.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/5409457356.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/rekiredipowakulixumax.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_off0000ca27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA27 17208 bytes
SHA-256: 2e28b9d0a7b4077936f3c168c2389e8bccaa3e4a3657165c3d97672295885791
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 10220 bytes
SHA-256: a8044ece334c89961eb09d627f360c5fc502d300c2b9acf7c708f0c5a7ef2548

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