Malicious PDF — malware analysis report

Static analysis result for SHA-256 9190e66024572c04…

MALICIOUS

PDF

107.8 KB Created: 2021-04-06 08:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8db2c727d27d55817cdb2f34857efd0 SHA-1: bc4bf8ed4732bc7805b78c0dd8b6e0e824ff354c SHA-256: 9190e66024572c04c75146645e94f444c31968d879a91e1617acb221b937746c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. This suggests the document's primary purpose is to redirect users to a large number of external websites, likely for malicious purposes such as phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=rudram+chamakam+meaning
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/jolisugabo_donamosuxa_fokotojuxit.pdf
    • http://ludshop.xyz/yamaha_rx_v473_service_manualuamoy.pdf
    • https://cdn.sqhk.co/wupifufexix/1ifJUXb/36843918821.pdf
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/920b6.pdf
    • http://juilopkiretlo.ru/global_startup_ecosystem_ranking_2019_top3acc8.pdf
    • https://cdn-cms.f-static.net/uploads/4387931/normal_6015c5a08494e.pdf
    • http://buyervannakupitvsem.xyz/how_do_i_reset_my_samsung_refrigerator_control_paneluskky.pdf
    • https://cdn-cms.f-static.net/uploads/4465691/normal_5fd15cae26f14.pdf
    • https://static.s123-cdn-static.com/uploads/4426080/normal_5ffd0a6458af7.pdf
    • https://cdn.sqhk.co/faxinomitux/EgeidKd/top_tik_tok_songs_2019_list.pdf
    • https://cdn.sqhk.co/fejukomus/BgjhdDI/65898716516.pdf
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdf
    • https://cdn.sqhk.co/gabebutiz/jhXiehf/download_rc_mini_racing_mod_apk_android_1.pdf
    • https://cdn-cms.f-static.net/uploads/4500670/normal_6011e27fd5249.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_79ed079a413442668887bbcd88a2c7c5.pdf?index=true
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_806c31babf9447dba5a077d1ccfdd5d4.pdf?index=true
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_88b8b36361d04ae489bbdfd1edbac8a4.pdf?index=true
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_64b1a1503fe04575b9656726a529eec2.pdf?index=true
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_251c408132214df0901b82c21e8022a7.pdf?index=true
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_d13f8acd796f44599f47b75956cba40e.pdf?index=true
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_751b007cdb204b5e9b9e17256b8a4557.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014dcb.bin
f2e33f55439f5596dc3afb949ab41f97f10555ff6dc5a638bf87744e7596d70d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCB 5216 bytes
font_01_sfnt_off00015f5f.bin
9afbbfc60ea1a094f50492baf3776e1994903509476a0b975f96892c128cd5a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5F 10632 bytes
font_02_sfnt_off0001841e.bin
b37e0867647e3d4e8d5fc2da62562982bc02e0be97f8d138618369deadf7516a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1841E 9032 bytes

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