Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd910754561e49dd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 19:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6aedb7232e21eabcdada1e6ec835b5d9 SHA-1: 1dfbb32761038b372191f8ff0849d6fa585b76d6 SHA-256: bd910754561e49dd8ecd2cfbcae94c803d8e4f107c4018957a3721d8192955e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=jensen+car+audio+manuals PDF link annotation
    • http://sushiosushi.com/uploads/files/41347204508.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/siwoxo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/80516172021.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/81068772204.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/defizaxamefakazedonofi.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/79193903690.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/55976016537.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/95684741931.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/94267890860.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/sonudek.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5c6e469ffbae9e264d76752a3502e186/3536764828.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd048d75e5---78789289844.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/42573489002.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/sezojigupelagop.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/kenikubukatipalomowiduj.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/besaxefaxovanovovixar.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/61594758057.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/31778626600.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/gebovebojib.pdfIn PDF document text
    • https://losungversorger.com/product/file/38464808750.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/49008116653.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/jekugiregorenirajubejir.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/pitekilodomogerulaji.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613011deedc37---luruserenukipexureko.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/xozobedenululedidixa.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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 17592 bytes
SHA-256: 547765211090545f3af617c8dcd2681f583b01321e3c4d3e1d382541bfbc03da
font_02_sfnt_off0001233c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233C 10524 bytes
SHA-256: 12671159a706c5c76cffe16fbc4c21fe63762988b4f0845863589397267f2fd0