Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b484b2b039e294…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 18:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 846517557773b27c979de854a4edb7ff SHA-1: b8df1b3c8f964997a9b7ff163e3f4291b0104f6e SHA-256: b9b484b2b039e294d20a97b8c89618b9ec451d9a8647195e1de536080b6c5564
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=where+can+i+watch+aamis+for+free PDF link annotation
    • http://asia-test.informacittadino.net/media/files/mebowitavebe.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/xobedegu.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/5598417133.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/91205178855.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/75437130592.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/wizepupibetituta.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210905070745_1403317433.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/zefasi.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///retogeko.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/39766471955.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/30197210785.pdfIn PDF document text
    • http://haphadoor.com/upload/files/petitutavexidusokikoru.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/22596445991.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/15181800732.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/faditudepuvoxatuwi.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/68006795406.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/bujutaveximewofaxiteju.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/13407033400.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/dasurikijejusuwafagu.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/66447485047.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210910050730.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/16176164026.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_off0000c1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DA 10636 bytes
SHA-256: 1d50c370c87ae6f05e6f25483cc0aff6bb2d3e3ea9832627e2b7937115e4e822
font_01_sfnt_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 18860 bytes
SHA-256: d0ada20c94d3290841ab93a794aeb838d01f3adff96f95023b112ebf9a2308f5
font_02_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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