Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f78083d0ea3d4b8…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 03:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 957bce2588562bd4d987b70a7f035723 SHA-1: 6bfca5653d93f836d5e49f9eea9959d1cb1338d6 SHA-256: 5f78083d0ea3d4b8d1663785670a3a092c3065d7334cbf849a9577fc9bac0f03
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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=how+to+turn+off+emergency+alert+on+android PDF link annotation
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/woronakebewenu.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/77904941983.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/6551956643.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/17876089808.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/35542488002.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/85202822702.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/83059875032.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/doligopodulibib.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05257f632---86492787026.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/83197018445.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/20517988216.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/sebokidosokamesumu.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/xipakogomatusasu.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/wadurewuduwe.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/71702241109.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/12596567004.pdfIn PDF document text
    • http://reylab.com/userfiles/file/70915752022.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/18300374064.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/kitum.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/68172629887.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/59465439586.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/43072374333.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/girozujisuwazitelaji.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/14338886808.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/liwesikosasabomumetek.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/qeg8u1hkvr232u5qjqpp2ic090/88968739490.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/45905105778.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_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 17948 bytes
SHA-256: a2b8817c665acb57e2fb0d9c9ba42d19cf8259e156c012c7016bad8790653a0f
font_01_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 10940 bytes
SHA-256: adadd477abbd4635daefffa5184d1bbc5482f46a5db44a2a78e7fb8c63282a0d
font_02_sfnt_off00012d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1