Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6774e0a7ce27c9b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-09 12:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65b54e952fef3c1069cd9a5857ca3791 SHA-1: ab710905cad2b6b614d0ffc8e0f8f065c7da24c2 SHA-256: f6774e0a7ce27c9b45c8343545ffb0c5669798703b67c828171ff86550129ffd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and forming a link farm, suggests a tactic to manipulate search engine results or distribute further malicious content. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://daehwa.info/uploaded/file/rozulagusagenomet.pdf In PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/29984363857.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/sixewujoloke.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/45818206291.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109090320159757.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613853c45ced8.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/21652349623.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/kisutep.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9a5b967b---kititevapik.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/tudus.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/6533900966.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/11850829451.pdfIn PDF document text
    • https://anfauglir.com/images/file/15303195052.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/93057446240.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/26409385270.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/50178031974.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161320c48b497f---fusutudiwomenobefuxogatu.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/nokaxunepipokaji.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/padowunitafanifivukusub.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/77887379704.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/92032555014.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/jezuv.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/82070968083.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090820205411822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+go+hack+for+iosPDF link annotation
    • 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_off0000be8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 10732 bytes
SHA-256: a05b5228514d956f6722f5bf96a41106445653dd2397978a68fab11ae4a9fd4e
font_02_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 16936 bytes
SHA-256: 7468d673e5608899c6e57bd01054cbca05fea6032b43766138db44ef68651dca