Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4dc50ebfbf0224f…

MALICIOUS

PDF

69.0 KB Created: 2021-09-18 14:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bc8e7ad79df2afe0f6cf8764da30e097 SHA-1: bf315e1f0cdf09576cc3779e011aa53a588f33f5 SHA-256: d4dc50ebfbf0224f5ea2fd81d4658fc176766e905b2ad5b96c6f4a7dbc76373d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the PDF and its embedded URLs point towards a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=how+long+to+keep+fried+chicken+in+fridge PDF link annotation
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/62293981694.pdfIn PDF document text
    • http://4bx.pl/public/file/1458300480.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d4b06109---mudofonipiwadumifo.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/puzarezazoduvip.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/xotet.pdfIn PDF document text
    • http://hocomesun.com/upload/25413734882.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/71825141935.pdfIn PDF document text
    • https://seikai.jp/free_images/files/79354510369.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/babaxel.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760a3b16ff---gukuvofewesaxuvaterofegoz.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/ramojubupagi.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/lagubozawonizadenez.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/98175403020.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/kivejawovufeb.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/13138924084.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/lilarapetefelexomozevife.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/42660373799.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210902042022_dbtccf.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/vixudoziletituvedoparo.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/sosaroxor.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xotebasemafalilimamolis.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/31237439960.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_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 14572 bytes
SHA-256: ab4ddae217bb7fb3fc283a16010587d2aafcc7bf32667d37a5a1aa7c36f053ea
font_01_sfnt_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 10740 bytes
SHA-256: 84a074165f890b06817acd7b6b221cb841a0ef6c1abbdb40627edb551246bbf4

Open this report in the interactive analyzer, or submit your own file for analysis.