Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef76b9fa81c99dc7…

MALICIOUS

PDF

66.9 KB Created: 2021-01-18 00:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c4e0c263dec7a9729b2f31e8ee08f618 SHA-1: 9befe102dea3b72463a6bdb424c89d123e8ab5f4 SHA-256: ef76b9fa81c99dc71f5b4702e583905151adbbe2190c6d2e4cd19a3700418d50
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious 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://trafftec.ru/123?utm_term=trieu+con+tim+pdf PDF link annotation
    • https://site-1174993.mozfiles.com/files/1174993/multipart_form-_data_post_json.pdfIn PDF document text
    • https://site-1172822.mozfiles.com/files/1172822/powerpoint_background_templates_invitation.pdfIn PDF document text
    • https://site-1176512.mozfiles.com/files/1176512/spaceflight_simulator_rocket_design_download.pdfIn PDF document text
    • https://binegizid.weebly.com/uploads/1/3/4/7/134764074/dilawenaduwerixo.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/ziwujuxigewanonibonu.pdfIn PDF document text
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/nikubibuker.pdfIn PDF document text
    • https://site-1168173.mozfiles.com/files/1168173/jezejelo.pdfIn PDF document text
    • https://site-1168117.mozfiles.com/files/1168117/badayer_racing_apk.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
    • http://dixolasafu.epizy.com/govakexim.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/35778571064.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/zelagapadigekiribigo.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/kindle_app_android_audio.pdfIn PDF document text
    • http://toramowajo.epizy.com/56749517842.pdfIn PDF document text
    • http://sojisij.epizy.com/lulowuvudetoz.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/android_apk_whatsapp.pdfIn PDF document text
    • http://pifutujotot.epizy.com/brentuning_vs_maperformance.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/bunozetolanoxe.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_off0000bfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAF 4712 bytes
SHA-256: 5f6ea3580e704d0ff14c9f0d1d777b3c7c91aac969ae7a98976d8925513f05a1
font_01_sfnt_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 9744 bytes
SHA-256: 88b7e79eccf8f4bd1fcec27b59a9d47d4cd0f226268f569fc1c84b8f833d3694
font_02_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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