Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f4cc37ed8d3459…

MALICIOUS

PDF

73.2 KB Created: 2021-02-27 10:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: c19ee9f39d9d3fb2ec96830ab958402e SHA-1: 811e15c44706789bf269b2903f23d8fa93dedf8a SHA-256: 31f4cc37ed8d3459281038561a6aae8e08a26dc375d3a23c0062345265ad4c4d
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=periodic+table+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381759/normal_5fccea016ddae.pdfIn PDF document text
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/3647144.pdfIn PDF document text
    • https://kosazalosir.weebly.com/uploads/1/3/2/8/132815054/1a3d26f.pdfIn PDF document text
    • https://dosisusibifoba.weebly.com/uploads/1/3/4/2/134236234/1165352.pdfIn PDF document text
    • https://xavedogaw.weebly.com/uploads/1/3/4/6/134659805/jeboxelara-tagajigirog-tadalivene.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/lipamesefodofe-kexexot-nupuvuvitawuvu.pdfIn PDF document text
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/buvuxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389107/normal_5ff4c42726ff4.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/58807679265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_5fe9e996c1f63.pdfIn PDF document text
    • https://zesajuletolif.weebly.com/uploads/1/3/0/9/130969916/nadaxodek_wuburegobi_pelipuvilekirur_xobexu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476011/normal_5ffba4b42f9d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/lusisomefom.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/piano_chords_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/23595404658.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/arduino_board_manager_missing.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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 5424 bytes
SHA-256: 66e6ba085c9f051f53a82607b290b1d04abcb4d1acf1612e0d82fe5aa13f5880
font_01_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10560 bytes
SHA-256: 7d71d5803ebcfdb8678dc84e80c00f7851d85533fe166537f41299a4f1b9af9f

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