Malicious PDF — malware analysis report

Static analysis result for SHA-256 0083976ace28fb7b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 16:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c5976f343aebf02f41168cafc4767f4 SHA-1: 0c348203f80cbef183d3789b8912ffc8741b8192 SHA-256: 0083976ace28fb7b687cf2aa870744d05d00ddfdc3e948013fc9f9ab707da488
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. 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 0.9992

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 https://tauthuy.vn/upload/files/zepedewugoromi.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/23298533502.pdf
    • https://equinox-e.com/upload/files/24301513784.pdf
    • http://dkstores.gr/userfiles/file/rasifipike.pdf
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/datewekisozevepavawupa.pdf
    • https://sproname.com/files/userfiles/files/70148360968.pdf
    • http://caythuocdangian.net/images/files/58302866352.pdf
    • http://venkateshservices.com/uploads/lenur.pdf
    • http://dobrejaja.com/Upload/file/lepevifufagowuxaka.pdf
    • http://glovimex.com/uploads/ckfinder/files/37370276287.pdf
    • http://partnerplus30.ru/images/fornews/files/24430452333.pdf
    • https://cissud.com/uploads/ck_editor/files/7515631973.pdf
    • http://nocleginaplus.pl/uploads/userfiles/files/kifefemawifavove.pdf
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/44758344460.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/veduwawume.pdf
    • http://psn-monolit.ru/img_file/files/wirozedut.pdf
    • http://ats-dz.com/userfiles/file/38282962859.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa831fb95---kolovarexe.pdf
    • http://2446665a.ru/ckfinder/userfiles/files/31706007931.pdf
    • http://goang-hann.com/uploads/files/202109180626121832.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+recyclerview+filter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf58.bin
68898d2fcaadf9120b65c1ffb90ce68b3a0fae1447108c8db72e1070dc0d362e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 10388 bytes
font_01_sfnt_off0000e703.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 16792 bytes
font_02_sfnt_off0000ff15.bin
432666543f92ed7189097dc13fd52ac7f3db6739a7ffe360e1626234be9c0311		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 18484 bytes

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