Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1a52de81285a0b…

MALICIOUS

PDF

85.7 KB Created: 2021-10-11 22:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90265dd9c303ac9cf1c590190511a73d SHA-1: 7e6728d1b567e1aeef7bdd590355f99e4b372f16 SHA-256: db1a52de81285a0b3afe7078b09c16920ae0939ca8743cf6520d517fa9c31749
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple hops.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://acsalma.hu/userfiles/files/repopezotobixuxoson.pdf In PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/79819580067.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/lovuvus.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/18785746388.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/61576541417.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/76505917140.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/rejemetijubepojoxamu.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/45556539680.pdfIn PDF document text
    • https://el-tall.pl/pics/file/2710274592.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/tejikulunakiziteza.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614cafc97c84c---53487001475.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/75138037493.pdfIn PDF document text
    • http://floramarble.com/uploads/49137953028.pdfIn PDF document text
    • http://leguido.net/files/73179782557.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/vavumineninasonemuwowe.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210907030033.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/81401846347.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/wirabuwiwuzoparaw.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/72617135658.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/98474152268.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/ruweparifiwonu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=final+fantasy+vii+official+strategy+guide+pdfPDF 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_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 11052 bytes
SHA-256: abd52820c8f994fa1f71e84442e6d7cd21f342f512b17e7d6ce4e1d212fa1da1
font_01_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 19036 bytes
SHA-256: 11cce9ac9ea5ac6dba7edda09e6fce081a078c5bbb3a1b0a0685192d26731cc9
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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