Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6adbbcff47615d4…

MALICIOUS

PDF

70.0 KB Created: 2021-09-10 08:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cace7353ad7d33952c3b922728132c09 SHA-1: cc196a1341d95899f1a266147dcccd5b5e9efd81 SHA-256: b6adbbcff47615d4087cb9f6cfc66c2ada127a97b537ecbeb756e917a7fa2bd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs pointing to various domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=quicktime+on+android+tablet PDF link annotation
    • http://emrc.ie/upload/imagecontent/file/judunosog.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/65661271249.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/loludozizosabutonasuwi.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/vivupogijidufazatoko.pdfIn PDF document text
    • https://akemi.ro/hirek/file/44523576866.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/mijesukapov.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/fajosawevusoxame.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/dubafo.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/jugajibuger.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/rateregadaworixorimu.pdfIn PDF document text
    • https://adikketiga.com/contents/files/butival.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/33590089489.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/pusukowowinovumez.pdfIn PDF document text
    • http://asja.ua/userfiles/file/50572344903.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/51079533481.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/zijipefu.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/65453538420.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/fenifibuwupivumanetinixo.pdfIn PDF document text
    • https://regenerateacademy.com/file/81886585202.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/89546777818.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd2c9080a---mexaxejiziwi.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5750035455.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sonutuvujumiletuluzolipi.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/44786516170.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/memozemov.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_off0000b2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BC 15292 bytes
SHA-256: 0ac0bc94a722ef57d8909edb4862beb6110f0f0749cd5996a7c1e92bea7e8581
font_01_sfnt_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 10752 bytes
SHA-256: 6d06009b0e976bb02a4efc253f029721ae6d2e643de21e9f5eac1c569d91eb1f
font_02_sfnt_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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