Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a21bc0fe64af15…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 11:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9a4b27142353f3e71f91624bd7b6565d SHA-1: 476b31226ad520c181cffb882661c9b97a65b0f6 SHA-256: 80a21bc0fe64af15330ff75a013cfe657d7b3cedee49547f4cea494c1342b8ba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://residencecarlofelice.com/userfiles/files/pajijunuguxubivu.pdf In PDF document text
    • https://luathoanghuy.com/uploads/files/65268051970.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/88007150890.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/24698577265.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/83499925117.pdfIn PDF document text
    • https://svltv.in/userfiles/files/wemododur.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/19280614213.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/76271797449.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/tenazalewelonib.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/tuzubebefapo.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/jitixufovivaligis.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c469b9646---34051588262.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/86484416021.pdfIn PDF document text
    • http://precisao.org/files/files/kosopazimubevod.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/judobawadojuzar.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/dewumezokevaf.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/tatunotatul.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/33610482537.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/vabimaja.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907175854673653.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/54046285045.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33172e73c---49234122405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+hide+apps+from+settings+androidPDF 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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 10976 bytes
SHA-256: 01ebf720be3489eb1e59efd83a7c2a4823b1eed15c417132a377ef26db6a4041
font_02_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 17696 bytes
SHA-256: ee1c6b2a43d1d82f2b887c5bec16707782085423a5f15379b870071931f8ed1a

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