Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a86b03384f6eba6…

MALICIOUS

PDF

81.8 KB Created: 2020-11-28 04:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8ff4954001d8ccf67d927ba128b4860f SHA-1: e347590f6ea2945c6f26190c59996cad9f536983 SHA-256: 2a86b03384f6eba653550eb4f631e72adf4d74e0f2b59efc4ef13a736bbfaf9f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to patient information, likely directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=baptist+medical+center+princeton+patient+information PDF link annotation
    • https://sopulekazixov.weebly.com/uploads/1/3/0/7/130776801/6a8bf003ade76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f95437cd958c.pdfIn PDF document text
    • https://fisegumatiwal.weebly.com/uploads/1/3/4/7/134722042/rexeg.pdfIn PDF document text
    • https://gebekogekikak.weebly.com/uploads/1/3/4/6/134694855/1b41060c346c.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lukuxaluk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5fadf89b6c72c.pdfIn PDF document text
    • https://mukozuzaze.weebly.com/uploads/1/3/4/2/134265885/fe84c8301e31e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473340/normal_5fb3fdde80378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_5fad8bb2cc005.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://uploads.strikinglycdn.com/files/9cea85c5-4ebd-48a2-879d-8714b1b433e0/fenuniwupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7921ce-858e-4a4b-87d1-9fe95dafb9b6/minty_pickaxe_codes_gen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001c983a-0ef8-41eb-a95e-24adc3fd50bd/prosthetics_and_orthotics_in_clinical_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69acb4b-0314-42df-b473-1b2d8faf3a3f/zewemavijigupiditufixa.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/skyrim_tower_of_mzark_puzzle_solution.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_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 5136 bytes
SHA-256: c40ab4165ac0458c4d34a4b7bbcebbb1b43b1ebf2c8af73277d768dd28814abc
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 10388 bytes
SHA-256: c077f671a8c98b2381bb2ac95348fe88627c528ffa155f16cd8ceee7e1a9b140
font_02_sfnt_off00012b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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