Malicious PDF — malware analysis report

Static analysis result for SHA-256 9519b5f2d5c38148…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 10:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26199b68f8df3c6ed82f165aad37b737 SHA-1: 0243f1d536e4b98f1e8e95ac42fe999de0c32c51 SHA-256: 9519b5f2d5c38148d44cd658fa0b189974b4eba133ebc1d8b1b96c0076f26d73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to PDF files on distinct hosts, suggests a link farm or distribution mechanism. The 'utm_term' parameter in one URL indicates a potential attempt to track user engagement with a lure related to 'fallout shelter download android'. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sportingfoundation.com/uploads/file/69905204751.pdf In PDF document text
    • http://sirindhorn.net/upload/File/xolojo.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/18863816896.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/lovaxovavarixe.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a80ee54b7---25317853731.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/49526461736.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/85488670697.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/97767231735.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/gepiru.pdfIn PDF document text
    • http://bibikid.ru/upload/46513381588.pdfIn PDF document text
    • http://edeins.com/userfiles/file/465203866.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nunevinefaruxuvevepa.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/32063368546.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/2362866587.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/13176844418.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/efe72e8bc201384789271417527958f1/36216489306.pdfIn PDF document text
    • http://art-ball.net/files/file/kodoropipurigafi.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/60106334985.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/figukusedifitapaka.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/99066884411.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/jopolubakabu.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/sofajaledaranudagum.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/68312805841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fallout+shelter+download+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_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 10508 bytes
SHA-256: 0cde13246ff0607f97245622d84e8a9c11cc06b380be11226186215c21e74e9e
font_01_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 18640 bytes
SHA-256: 347fc80cb136cfc334561de2a60e71a221936a3a6de7152453858aa9d962ca9a
font_02_sfnt_off000115e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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