Malicious PDF — malware analysis report

Static analysis result for SHA-256 413f271c2950bae6…

MALICIOUS

PDF

77.4 KB Created: 2021-02-24 21:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 88845ab0cadd3fb39a43b508a2d68b43 SHA-1: c72e9904542923926d62b583081fab7027e11a43 SHA-256: 413f271c2950bae628c9f867737e2009604371e65c75404eafb6663ad178498c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a link farm for SEO manipulation. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to direct users to potentially harmful content.

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
  • 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://jacksth.ru/aws?utm_term=area+formulas+for+triangles PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5fcca1652b0ae.pdfIn PDF document text
    • http://kismyketio.com/battle_royale_coloring_books5xa2y.pdfIn PDF document text
    • http://opit.space/speak_out_intermediate_tests_answerncxzu.pdfIn PDF document text
    • https://mafopobivo.weebly.com/uploads/1/3/4/3/134322173/33945.pdfIn PDF document text
    • http://citimart.online/droites_parallles_et_perpendiculaires_6me_exercicesyj114.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/61955820460.pdfIn PDF document text
    • http://infokurs.design/157874969217ymrp.pdfIn PDF document text
    • https://mejoraxu.weebly.com/uploads/1/3/1/3/131380998/3144129.pdfIn PDF document text
    • https://jovawovifo.weebly.com/uploads/1/3/4/8/134883275/02da968d4b60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_601e1f3c8d4f2.pdfIn PDF document text
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/gukode_kujotesizak_kinetakelido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pogolo/87351008243.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/vojufidep.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/free_jigsaw_puzzle_template_for_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/87696837007.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/91079456567.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/free_microsoft_office_2016_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/54748748305.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 4960 bytes
SHA-256: f9698985e35e08c7c1bd0edd232eb4dc7a743481266e009bb5a7a832ff90c0d5
font_01_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 11828 bytes
SHA-256: 8ce59e81f05a736530b24694d4517e6a4e7b189c0712b6021f5d8b1b2c8ff1ac
font_02_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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