Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52f88e2d11a5072…

MALICIOUS

PDF

65.1 KB Created: 2020-11-11 21:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 08165318c5b97066246d994e11247b7a SHA-1: 2f3b1da047e302c810cfe2e3b3f2eae7c452106a SHA-256: c52f88e2d11a5072f7b755690a838f12a1800b8f79ceaf01383ffec05bf30f33
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to 'traffine.ru' and a PDF link farm. The ML classifier also strongly indicated maliciousness. The file likely serves as a lure to direct users to malicious infrastructure, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffine.ru/aws?utm_term=but+formal+synonym In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f9285a5795d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5f8a56a164531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_5fa77ef4d3596.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/2219fc42f20d68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f8a70429b554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5f9bdb93529e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5f9e43f994511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f88871d7bc88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_5fa846fda7fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fa11e22baa21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5f8ac099f2b7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf6edcb-c23c-4955-8aff-6bffe9eb4787/gexupolowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e49e10a-6d60-4dba-9421-09a488cb6ed5/sacred_stones_chapter_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c677e807-fa5e-4629-8509-979267b7cc74/the_night_face_up_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/windows_10_hipaa_compliance_configuration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0688a514-6661-4c2d-848e-eb289f0a9680/arkansas_cdl_study_manual.pdfIn 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_off0000c15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15F 5064 bytes
SHA-256: eeaef85713b550cd80bc0438cfa6063ea3c089066c1c902fc8050483068de143
font_01_sfnt_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 11148 bytes
SHA-256: bf9d666c5edfbc7e376d213f4ed2a34eaa64b508aa42a3f243d3923f150e43b1

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