Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4186923c608230a…

MALICIOUS

PDF

81.6 KB Created: 2021-03-02 21:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6f87a57356ce2f28a7821c168078931e SHA-1: 43bbdae2eaf028ad7c0c064715a2c3516bb3f8db SHA-256: e4186923c608230ad2ba3b30d5d55a839d9107fcad0e7249b4d8dc9c42667c34
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm or phishing campaign, with one URL directly related to the document's title about ear ringing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a trojan delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=a+que+se+debe+los+zumbidos+en+el+oido PDF link annotation
    • https://cdn.sqhk.co/xinulezebi/6iWgfLx/daily_deals_muskegon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_600c9bb640c04.pdfIn PDF document text
    • https://xagapetudiza.weebly.com/uploads/1/3/4/6/134686513/4931787.pdfIn PDF document text
    • https://tikiruwilowu.weebly.com/uploads/1/3/1/1/131163793/6345817.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/clOfwjd/69137572457.pdfIn PDF document text
    • https://tamilavijunaw.weebly.com/uploads/1/3/4/5/134506647/27e1ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495707/normal_60016ffa2ce61.pdfIn PDF document text
    • http://sodamasagu.66ghz.com/92419596744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386849/normal_5fe3690572771.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/SThhie8/vomojajapij.pdfIn PDF document text
    • https://cdn.sqhk.co/vebapejun/cjdjbje/world_of_minecraft_server_ip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5ff25b721edca.pdfIn PDF document text
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/1211073.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/pafexegud/report_back_to_me_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/83151227878.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/lavaxifewegefi.pdfIn PDF document text
    • http://zinikifog.rf.gd/tujoxinirir.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/acc_cholesterol_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/gudabaribozu.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/45083435573.pdfIn PDF document text
    • http://xetizeburekikat.rf.gd/dashcam_g1w-cb_full_hd.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_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 4968 bytes
SHA-256: 4a115cdc3093c1dff145f3d10d0596e20e344ea92ed2b09de85caba14d22c50c
font_01_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 12452 bytes
SHA-256: a9a8b17ac2c22e4220ea6a9e7a804d7b580f7671904a93721a83e4a41a3ccca2

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