Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09c9e36679528e9…

MALICIOUS

PDF

107.3 KB Created: 2021-03-08 17:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b7a68608a34a1ceefff5aa32715535f SHA-1: 3b855135f497e677bcbb3df49562cefce7acb572 SHA-256: b09c9e36679528e951ad3043a5bef59ac53f4dbbea7058a4dd544023a73d56f1
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though partially corrupted, contains text related to 'bitcoin' and 'wkhtmltopdf', suggesting a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/award?keyword=que+es+un+bitcoin+pdf In PDF document text
    • http://zereteleriw.getenjoyment.net/newman_os_cookies_vegan.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/nemexixamizuboridizelosob.pdfIn PDF document text
    • http://zuvatewovu.scienceontheweb.net/oedipus_the_king_by_sophocles_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_b77512b5e88e44868683bb685e0be4e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/brahma_kumaris_murli.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_8d92bdefe73b44efa388c4b94b95085e.pdf?index=trueIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_d5836496081f4635a370c4bfd1c0eb61.pdf?index=trueIn PDF document text
    • http://muluwokixo.onlinewebshop.net/xujojixagesofimodoburuleb.pdfIn PDF document text
    • http://bexalawisilinot.epizy.com/financial_reporting_and_analysis_problem_solutions.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_2306841d81cf4d9aa9a8c460b7df2b44.pdf?index=trueIn PDF document text
    • http://pimekepodi.epizy.com/masinalujixunirenolugon.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_8656349fd2ea426fab1b0e93f336e722.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_7622bf376b18401d9bfe949326e0a105.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_1517ffa7a82146cb8b793845b0e179d7.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_17228e05d33640538386108205a18db1.pdf?index=trueIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_1d0a15ec27f249929a6d068bba7ad882.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_538c5d72e3e3404d8270fb90f23c92ea.pdf?index=trueIn PDF document text
    • http://familule.epizy.com/15305485429.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/zedelupefowexodogaguvo.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/xiwutixoxoluputukexon.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/47608582383.pdfIn PDF document text
    • http://vimozav.epizy.com/gimp_user_manual_free_download.pdfIn PDF document text
    • https://2a4df843-e27d-4a8c-8c95-00f1a368ad21.filesusr.com/ugd/b5472a_d762da9ba8ec47c881e9b87930cfe81c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ximupuv/annual_report_2018.pdfIn PDF document text
    • http://jelasojeb.rf.gd/29669737863.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_e7e5da872a6a40dcb18de7a843c6194d.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_e6badb5a0eb14fdeac2b7e78d43f98a2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000166cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166CD 5012 bytes
SHA-256: 0f02cd53f365e054d8720a8ab29cc1c32d667157487fe061c6b9ecf60b781cb4
font_01_sfnt_off000177ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177EC 11660 bytes
SHA-256: b3b653d5ef6746bd11c4a541b5dd802be2cc3700bc2c09ed45277872ab54a3cc

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