Malicious PDF — malware analysis report

Static analysis result for SHA-256 c458f1c7f819d999…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 01:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 42b058b2ddc1e2f30dcb28db88dd2be8 SHA-1: 5d3e0d281ae41a412e32feefe3b448286b3a981d SHA-256: c458f1c7f819d9998b57d6f2a3de6a8e901d03da1bfbdc0345e5bdf18dfc91e7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://screen.by/images/file/65806504176.pdf In PDF document text
    • https://soswzgierz.pl/web/uploads/files/71043964571.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/59014678931.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/kalar.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/62215332149.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/kogaxekaruxabezipepuvoso.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/tajinemoninetu.pdfIn PDF document text
    • http://elitacasa.it/images/file/vebiguwovopuzi.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/jewoxibovenuzuleb.pdfIn PDF document text
    • http://speckrepej.com/upload/file/fajomufakimetuvasebif.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/50365596281.pdfIn PDF document text
    • http://zxsolar.com/d/files/rudis.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/43807298088.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/budex.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/vaxalezogatod.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/burugigefugepezeparavudi.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/zexafilowitifivopozow.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/sufaxodozasikonejawiti.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/witerunofajimubuguzup.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/wafowakogejeloxifawejika.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/12636d02d9cb17135b5c13b6b20b410b/gekapemovofoj.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/76966195943.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/58260036229.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/15163738395.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/sutoximefunadofuzujarude.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/silukitidakodinemetabavos.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/72228732888.pdfIn PDF document text
    • http://chinazzjx.com/d/files/rajod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+infinity+train+demon+slayerPDF 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_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 10696 bytes
SHA-256: ace8dd84f91d18f49df7af52f1c47c968af081c1d258e37e3893fff173adb02d
font_02_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 17568 bytes
SHA-256: 09b0cf6b7ae4fed4b372b75e44277ca9596e478b002738c39792ba6fdf2b1ade

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