Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefdb0b170291058…

MALICIOUS

PDF

69.4 KB Created: 2020-11-17 19:32:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fcc31e84d2aa0b31e85ad4022ac1f2b5 SHA-1: aefb291b6bff9c298a840c80728a9233adbfc5ed SHA-256: eefdb0b17029105837587e34cacabe41a3c9134829119338c1a0344df33c8abd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. The primary malicious URL, 'https://trafficel.ru/aws?utm_term=borehole+logging+sheet', suggests a phishing or SEO spamming attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=borehole+logging+sheet PDF link annotation
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/boroxonezibogapewive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_5f9d5a53becec.pdfIn PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/kozetanomevesamili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d47d10f-af6b-4b72-810a-50cda5ec8052/punch_800a2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a2f833-3d27-4ecd-8a1e-5154016e5b6c/xuvonoxukunelelivutusib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e773282-9161-41af-8ffa-cb414ea795a2/myst_iv_revelation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae14876-0008-497d-aa8e-c90e510d927f/firabajotidorole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3926036a-84b0-4475-a98d-ba436071e070/jitumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6680447-46a5-479c-a593-5c1fe3d6d6ed/phpmyadmin_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58df5b9-9135-49a3-91d6-114d677c590e/irregular_verbs_worksheet_for_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac5473c-494a-4b49-b275-126ce00964a2/holt_environmental_science_karen_arm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/556a5d95-ecf0-4be6-b08c-bcf46730211b/dulonufejaduxadoxikowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b410560-0807-44fe-9a60-fce85cb0cc71/firemaking_calculator_osrs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb8adf2-0b0d-448b-b3db-030bb52036a3/89404004773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffc26e1-5220-4705-971f-6fc4a61a3b54/rafoledalediropunod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb466fef-0915-4dec-93d9-f19284a4a1de/63128001730.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_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 4784 bytes
SHA-256: 9f402a49c55bfbff030147296dc3ff5461caf32f1bad504098653af518d09e46
font_01_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 12196 bytes
SHA-256: c0f99b07a728599394c9e526ddb1065fa03286e8a1bdd6e06055b8a968d53663

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