Malicious PDF — malware analysis report

Static analysis result for SHA-256 79312275d2d425ca…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 19:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 078ae80da75a2b196bd77729185633a7 SHA-1: 02b0a1c3ca6e2835b501363ca512b125ec74f56f SHA-256: 79312275d2d425ca2a4f8373e2c1e914dc37e122a690da5096b2c5d72c8b2d70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's purpose is to redirect users to external sites. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=watch+extraction+2020+online+putlockers PDF link annotation
    • https://duvanco.be/docs/files/51565385408.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/74011920246.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/mutova.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/rigifedipo.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/21233913051.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/garitupulivo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/iogifl2q58gi7dse3pqsn1o8sq/7009757756.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/fadob.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/kemebisutun.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/sirab.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/96742105594.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/65517650545.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/vozaxevijifowoxemivowiko.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/lemoxut.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/48479370776.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/nepopafalepixof.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/lewikatizimowilojibewoxu.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/baramizewekujuvobixamivos.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/68074859832.pdfIn PDF document text
    • http://hijoin.hu/editor_up/tutugomujikal.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161ed6c6b5---3877782830.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_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_01_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 11000 bytes
SHA-256: cec233c3a65dc2aa228280221132e9fbace63bc4a50ebea586ab12c7294ef919
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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