Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c6247738d57f37…

MALICIOUS

PDF

78.3 KB Created: 2021-04-02 06:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bda0ecaf25076acf1c28966ea91cd341 SHA-1: e8dc0e8c842a12fe3e7ad2338b6f5b32604ce281 SHA-256: c4c6247738d57f37eaf9021e51351d078f5039eb8dde4fb8fe2d2fc36fe2974a
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL appearing to be a lure for search engine optimization. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://lozipotod.ru/aws?utm_term=what+high+school+courses+are+needed+to+become+a+marketing+manager PDF link annotation
    • https://fozaronu.weebly.com/uploads/1/3/5/3/135349809/vitelet_puwukeganagizik_lasetepu_kesovedime.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/2a6bfe.pdfIn PDF document text
    • http://zekabor.iblogger.org/smc_pneumatic_cylinder.pdfIn PDF document text
    • https://kakagigaj.weebly.com/uploads/1/3/4/6/134684555/fijarikuzumimido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_9882cfc0adc1406f853de57bebce9f45.pdf?index=trueIn PDF document text
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_a6723a103fa8475ca043faa97e6bdcb3.pdf?index=trueIn PDF document text
    • http://zilazop.rf.gd/dokavevakosenuta.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_929c8388a8fa4ba2ad2e1b942afb08a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanubili/4920857015.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/android_cardview_corner_radius.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_065451d1b18f4dcc9bb9a853d0afc014.pdf?index=trueIn PDF document text
    • http://kowefejarozop.epizy.com/difference_between_systematic_and_random_error.pdfIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_97eeea9ac45d40588eb91650119d4bde.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_ea177520589142cfbf5a2049997f67de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/53875482535.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/83548358441.pdfIn PDF document text
    • http://gofofeset.rf.gd/lerot.pdfIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_eb0010f288ed4c8291ad46c5cc2ae989.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/jofopesakimeb.pdfIn PDF document text
    • http://difedomuki.epizy.com/cancer_journal_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/bovuxowafozozerudagedeb.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_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 5568 bytes
SHA-256: 89ca989cac52a06f9e844631aa2917134eac273a772fac199d64e7cf5d5e8f44
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 10972 bytes
SHA-256: e8561ed13fa415ec058a50fb24324cdcb7bb15c1ac519440869fada7e6013b42

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