Malicious PDF — malware analysis report

Static analysis result for SHA-256 18eac6e99ed13609…

MALICIOUS

PDF

77.2 KB Created: 2021-04-15 08:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 38213ea146359754689f05da347d09be SHA-1: 2a1f780ad0f91a63580add957db0d60a4f998f72 SHA-256: 18eac6e99ed136098346e55739b63019ed6c7929db04e22af5f8850c9d8c3464
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, including one to 'gimoguvi.ru', suggesting a phishing or SEO spam campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the structure and embedded URLs indicate a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=can+you+sue+guardian+ad+litem PDF link annotation
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/masuxerulevurexuwas.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/77254.pdfIn PDF document text
    • https://wemavejuza.weebly.com/uploads/1/3/4/6/134689468/6487298.pdfIn PDF document text
    • http://tututot.mygamesonline.org/38636728014.pdfIn PDF document text
    • https://bofuvozera.weebly.com/uploads/1/3/5/3/135331850/9945054.pdfIn PDF document text
    • https://zetopemonosur.weebly.com/uploads/1/3/4/6/134678414/d6ceecd03c4c614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_90d22011050d48e98d62ec55e2f698ce.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_105cdc434b4b4535a481626b4a2e8f09.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_0e38049375c341deabddf90f342bfa60.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_13e55b67b518486f9b1a7109f5e2a699.pdf?index=trueIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_064b7a59523740349190a31e7e8290e6.pdf?index=trueIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_d04824b0c4a9450e84cb01214c9fbdc7.pdf?index=trueIn PDF document text
    • https://3ea853e4-7f2b-4fb0-9229-b04907a1e321.filesusr.com/ugd/d94095_95ee403355194d30ae45827e6354b3cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f804747-5100-4182-b342-0d292450c805/11561407231.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_73abdc11cb7748ee97d18d017e6aeaf2.pdf?index=trueIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_dad9205629b547009f564eef78d186d8.pdf?index=trueIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_d2c77a6aac094a05b59c1e6b49d760f4.pdf?index=trueIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_dc8cc27b7b4d470eaff1fc345c4fdae2.pdf?index=trueIn PDF document text
    • https://70ab076f-8fb6-4ffc-bf07-23e8f970f277.filesusr.com/ugd/cac9e4_c435eda464ec41de8b787636e3fd1f6b.pdf?index=trueIn PDF document text
    • http://zujisofivo.onlinewebshop.net/arithmetic_and_reasoning_books_in_telugu_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992b32c8-3970-437a-8a57-8cb5d9980099/the_monk_and_the_riddle_summary.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_a465be016ae94bf8a8147841f6ad1e92.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_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 5152 bytes
SHA-256: 2f71259d38762666f681e853a849da9cdb2d4fdf84744aaa1626d93f15c9d7e9
font_01_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 10584 bytes
SHA-256: d474f60eb885cf0b041391165138f153ddfc2f613a4614d69f160424533a9923

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