Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde5e4e5fb49f55e…

MALICIOUS

PDF

84.7 KB Created: 2021-03-20 21:13:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0c45ec2bcc75edec64b1e400d75ac87a SHA-1: 2e1816183e7d890c8e91ecf8b8de12776168d603 SHA-256: dde5e4e5fb49f55ee131b89dd0b3f3061d9273637a77bc028dc41d1e21f7dada
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/wix?keyword=wonderland+online+training+guide+1-100 PDF link annotation
    • http://tryse.xyz/46356559709x0nig.pdfIn PDF document text
    • http://gufutaca1.xyz/what_is_the_absolute_and_relative_location_of_china46r0y.pdfIn PDF document text
    • https://dumisoxi.weebly.com/uploads/1/3/4/6/134625223/9418159.pdfIn PDF document text
    • http://kanshoper.site/how_to_install_mods_kerbal_space_program_macgvjby.pdfIn PDF document text
    • https://revivumusemob.weebly.com/uploads/1/3/5/4/135400225/xerabapesivusi_varozovebikage_wupose.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/27262683961.pdfIn PDF document text
    • http://fruitslope.online/91170587969fsz6w.pdfIn PDF document text
    • http://blognews.top/husqvarna_viking_sewing_machine_price_listm633k.pdfIn PDF document text
    • http://bunagutafa.getenjoyment.net/21433640640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_8f9b6b8b8789446c9cb8958a51d18ae5.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_2d03ee369ead44408167795462ce6138.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_1fdb528347484e3d88930c23479ff930.pdf?index=trueIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_0685b646439e4966b538fb0b56fe9d1f.pdf?index=trueIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_5b6241a4d50441a8981e3c6a4214a75b.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_fbb4e9bfbb264b72b2f3dfda5415d0ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/237fcfd1-93da-482f-8bd7-05e154f99bc1/dan_brown_da_vinci_code_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6222b90-d7dd-4652-83e8-d422b73d36e4/why_is_my_folio_keyboard_not_working.pdfIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_de2205ff2ade4d74b3cf16e7851c4a0b.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_159bf21dcc1547a1975c760b58cc39a3.pdf?index=trueIn 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_off00010d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 5056 bytes
SHA-256: 71c5946c5c90ad27a11c653055e2dac2f07dfb535865e9993404b875aae414e9
font_01_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 11180 bytes
SHA-256: adc23628f45c60f88eb2c69beceedf09a504bd5ac2d34b620276d96005a1f71e

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