Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa4a98d6c2480f3…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 04:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b837958ecdc22eb55c72d780131a2f4a SHA-1: be2ced89540b1c0dc619d383ede81b04421110d2 SHA-256: efa4a98d6c2480f3be4faef47047dbe0d2e96a0b743b2326cb14f7d5af4cfa3f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with high confidence. The presence of embedded JavaScript and a large number of external URIs, many hosted on disposable domains, indicates a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is part of a link farm designed to obscure malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=3+letter+word+that+starts+with+f PDF link annotation
    • https://dhesient.com/media/bedilomavolijekelosukuw.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/24667620601.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/didujepe.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/24371998485.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/70648398604.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/64853272745.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/wonidijedizemagagugize.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/rosudazawusujivakudobax.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/25938901528.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/86201163729.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/kofolanavujosowu.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/watozibaforuguzisopezoz.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/39ecfd381823cf1adf3d1665972086f4/66403941370.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/mafifavovanasijelitijela.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210906_182120.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/wirored.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/zudowugekenonopisituze.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/20646046955.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/tibufamezu.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/ponukamasiriseno.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/dafanarenigejobap.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/61272675946.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a827936c7d---kiliz.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/36184870073.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_off0000d134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 10508 bytes
SHA-256: ce28e68efc12c1150abe535ee6e64ac3a796d87dfaa260d80c5ea50a854b6049
font_02_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 17888 bytes
SHA-256: 39e06e5a0cd74ad209606cc2fa20a947d01c7c4a524d3efa8901ef2e13099b88