Malicious PDF — malware analysis report

Static analysis result for SHA-256 99623a562c8aa775…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 11:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 368176d8f8181b63138a72c621a42abc SHA-1: 11dcd77b4aa9ffd20f8c15c1622c2a8acf172878 SHA-256: 99623a562c8aa775492df92548aea8270616b2c12fbd1ee77657fc0b10c1aab3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript or other exploits to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pezenasenchantee.fr/userfiles/file/32357997578.pdf
    • https://univerosg.com/ckfinder/userfiles/files/81139463092.pdf
    • https://toyotaautobody.com/ckfinder/userfiles/files/95980184978.pdf
    • https://zweefvlieg.net/userfiles/file/74373347884.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32805490500.pdf
    • http://www.chatanakonci.cz/userfiles/file/72152979621.pdf
    • http://unleadedcoffee.cz/soubory/kalejukinolevupebepu.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/44618322738.pdf
    • http://covina.crazyrockinsushi.com/uploads/files/68275620248.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48582047630.pdf
    • http://eva.am/files/772e5cf5a4a67f7f.pdf
    • https://www.institutvzdelavani.cz/files/duwalikofop.pdf
    • http://autosoftware.company/autoresponders_images/files/zogobadosasololabutawipek.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/julinep.pdf
    • http://blekinge.boj.se/uploads/userfiles/files/25582397492.pdf
    • http://mikomisushiwc.com/uploads/files/65626779542.pdf
    • http://debten.net/UserFiles/File/dunifalivuda.pdf
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63062352710.pdf
    • https://picinterior.com/ckfinder/userfiles/files/79456188487.pdf
    • http://sapaelitehotel.com/webroot/img/files/mapumavetobuxoge.pdf
    • https://quatden.vn/webroot/img/files/14617359740.pdf
    • http://hyundainhapkhau.net/upload/files/xisiduliregegabavi.pdf
    • https://malayalamfoundation.org/admin/my_files/file/narenenejomep.pdf
    • https://areicon.com/images/file/27689186679.pdf
    • http://homelife-superstars.com/image/files/60676427724.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pick+a+number+between+1+and+100+game
    • 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_off0000e199.bin
d5a38fe33e2511cba79a11f5c2b5f1e2bd6b0fdcf072c056d9aa0a227d48c0b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 17848 bytes
font_01_sfnt_off00010fbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 16792 bytes
font_02_sfnt_off000127d5.bin
501b422f83568e0f009db15aece2289f5e7a511848cc7c6ed22f5d0293f34de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 10972 bytes

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