Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59e9e31186a20f2…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 12:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcdf52a59ac3a87f17078b0ad17e98d1 SHA-1: c6a7becb407b2fe131d1699e10aa54e26625012d SHA-256: b59e9e31186a20f2a780c02892aeb6022733d7829ccd8dd1f8d74e5fb50419dd
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to external domains, indicating a phishing or redirection attempt. Heuristics like PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to download further payloads or collect user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=henry+golding+gi+joe+snake+eyes PDF link annotation
    • http://52fotki.ru/ckfinder/userfiles/files/21639632625.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161452aa8d31f5---rasexag.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/56876223685.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/xijatul.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popogesowekamav.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/rabupidamojudovil.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/23342636238.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/84202039819.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/wisuxodenodusi.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/tutekujapun.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/duxibezukij.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/20835526311.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e4fe0df1---42246697729.pdfIn PDF document text
    • https://motoralbini.it/files/file/79408200985.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/13635315163.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/wurizaguzanarejete.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/61757264444.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/30245516387.pdfIn PDF document text
    • http://agavietnam.com/img/files/98523927764.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109051322441296.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ef19c83828639196a78e7e057761e417/muzilotewobufumomegeled.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/supojemewejabo.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/19207692386.pdfIn PDF document text
    • https://duvanco.be/docs/files/68384695744.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_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 10652 bytes
SHA-256: 05edf2767dc895d1b6dcfdbff1d2d16cedf97c429a73a7ae3366bdfa5837f2ae
font_02_sfnt_off0001173f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 17840 bytes
SHA-256: 97d21c2c4c18c573c368acb71982bfa8a8ebbe6e93aaa5f30eb6e4ce41c62e52