Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a60c46b66d38d2…

MALICIOUS

PDF

69.5 KB Created: 2021-10-05 01:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 19425732e1f54482acf63264056c1405 SHA-1: b6080b3e117b74dc4da994d55fe0db75f91bc9a2 SHA-256: a8a60c46b66d38d2bf4c84345883326205f17c93cc932c4a76211dbe1e96c7c0
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://krisoc.ru/uplcv?utm_term=terms+and+conditions+letter PDF link annotation
    • http://peterpan1996.it/userfiles/files/rederofidimixinosusezad.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/27141819441.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/ribabolasepipepovow.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///70177917682.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/83824476290.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/sisoga.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/guposirodefika.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/mojasewomaw.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/82342530548.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1615a11b8d8203---napopa.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/67654300751.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/23100304652.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/viputamubaro.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/gugegebajova.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/9818208636.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/19849932790.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/rojilerozonaraxigixaza.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/30716213175.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155acdf045fc---javeviru.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/46876108042.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/96112900580.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/lapata.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/99519912987.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///73544970816.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/xozutusedipukiw.pdfIn PDF document text
    • https://rjpexport.com/files/xejibubuwadegovam.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210924183728.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_off0000b37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37E 10492 bytes
SHA-256: 25de10b6222ae5a228488762576703d112e44aca62b7efdda781ca86f8108665
font_01_sfnt_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 14692 bytes
SHA-256: ba798d83f15f9d25f97c4546814dac5678a73cd3cffe935b6cf0905cc0cb47c1