Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6376e4fdd340e23…

MALICIOUS

PDF

78.7 KB Created: 2021-04-05 14:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7a65864fd8a165a5b94137444c8bf3a9 SHA-1: 10a9d8d503643f338ff878369b1b9e2ef51f4eda SHA-256: f6376e4fdd340e23c72f082cdf89405f16b652c9630b10baa226a6070684b9ab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/award?keyword=chuy%25E1%25BB%2583n+%25C4%2591%25E1%25BB%2595i+t%25E1%25BB%25AB+file+pdf+sang+h%25C3%25ACnh+%25E1%25BA%25A3nh PDF link annotation
    • http://ig-about.net/free_letter_b_sound_worksheetsusasb.pdfIn PDF document text
    • http://plusstore.pro/itil_service_operations_certificationwmfb0.pdfIn PDF document text
    • http://gozuwifaw.iblogger.org/solid_slab_bridge_design.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444096/normal_6026782591584.pdfIn PDF document text
    • http://foramodosug.mygamesonline.org/wijafimitukazim.pdfIn PDF document text
    • http://kawopewil.22web.org/mubejedisokumugenadel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_60568c6611ffa.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/kafevubojukit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408878/normal_6008a0be28792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5ff0ae73458c6.pdfIn PDF document text
    • http://beritox.medianewsonline.com/sanewamolu.pdfIn PDF document text
    • http://punejew.mygamesonline.org/denanulejuxidod.pdfIn PDF document text
    • http://dimax-matrasy.ru/apa_citation_book_format_exampled4wqd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_605ac55021896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pimoxonevuwewax.atwebpages.com/56297287129.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_146ffae749bd41298f8e0e4a48775f3a.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_483f0ed013f14d988976ddd7a1a384b8.pdf?index=trueIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_cae1e982d8714294b782536050fb58d0.pdf?index=trueIn PDF document text
    • http://gizogorofu.onlinewebshop.net/cctv_camera_presentation.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/tesidavezafivokofowitafa.pdfIn PDF document text
    • http://rimatos.epizy.com/blank_africa_map_quiz.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_66d2e4abad6e43f089b940daed547fa6.pdf?index=trueIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 6144 bytes
SHA-256: 42f50f75df3e43df7b17aee5957386e5f62be93dd4ab825169174909cc67a93d
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 20320 bytes
SHA-256: d1c7523dd1eb53084b383d191a9f7e2b1482ff4cd72b4eb6b431b3bf7a32a15a
font_02_sfnt_off00011cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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