Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8ce6be966b1957…

MALICIOUS

PDF

82.0 KB Created: 2021-03-21 03:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d25405a11623f17cfeac206a631af7d1 SHA-1: 2578fecfd19eb5569e1fc304c2028b69da0c665e SHA-256: cc8ce6be966b1957c4859bef20e4ae33928af9b994df06ebd907fd9882ca19a3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the primary goal is to drive traffic to external sites, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=contaminacion+atmosferica+mexico+pdf
    • https://cdn.sqhk.co/lanuniwa/Njabghe/ikea_bed_sheets_uae.pdf
    • http://mizejodaf.mywebcommunity.org/stock_market_live_graph_today.pdf
    • https://cdn.sqhk.co/kuwusemob/kijchgo/visolonos.pdf
    • http://xokebidukefu.getenjoyment.net/como_hacer_bases_de_datos_en_excel.pdf
    • https://cdn.sqhk.co/kufejeni/hjhjOgd/toolbox_for_minecraft_pe_not_working.pdf
    • http://jaxagogilexet.sportsontheweb.net/bissell_powerforce_bagless_canister_vacuum_cleaner_specs.pdf
    • https://cdn.sqhk.co/tifobebe/j6byRhd/pefopasud.pdf
    • https://cdn.sqhk.co/kofatuziwu/Tgcarjb/pooking_billiards_city_download.pdf
    • https://cdn.sqhk.co/xasexuwosul/gDghAhj/regimento_interno_igreja_batista.pdf
    • http://lejunuzegakikuv.mypressonline.com/78717777141.pdf
    • http://gexerawoxabo.iblogger.org/characteristics_of_computer_file.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://moxadokikubod.onlinewebshop.net/create_bookmark_in_online.pdf
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_e21d474dc770442792d76b80673c88dc.pdf?index=true
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_dc7f461aadf14d07813afd78dfaec6d9.pdf?index=true
    • http://pedasamofujexeg.rf.gd/15916156236.pdf
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_57b56b1458ab487d95ac8669a00b04fb.pdf?index=true
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_1aa941c3eb0c490c91d52ce86c4b06fd.pdf?index=true
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_6e5185f34c37480ab72b2aad26c7df1f.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a4.bin
a13e8ecaf1aeb420f5c06a2765bf5c4a2ad1440405a701fa9e22852f444792b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 5244 bytes
font_01_sfnt_off00011263.bin
04fc0e13bcb299d5f9ea66c34ded7987846544b8f6ff2e0da43918e05c4cb945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 12088 bytes

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