Malicious PDF — malware analysis report

Static analysis result for SHA-256 0832f43734108d6a…

MALICIOUS

PDF

80.4 KB Created: 2021-03-19 22:29:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 450e3577102d1a7bde43557a51ea7a28 SHA-1: 5bfaf4c099e237af48eff9e4202c6f31f32a9970 SHA-256: 0832f43734108d6a11f7e747967ef8b2ffab50afbf80bab7307533c21f87e588
186 Risk Score

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 0.9967

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://vilenefex.ru/wix?keyword=magic+chef+rv+gas+stove+manual PDF link annotation
    • http://xomunuxeju.sportsontheweb.net/dobasosaxuxet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_5fe95dffe6a2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_603e2a497ef46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_5fdaf1a78ec8b.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/georgia_drivers_license_name_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393911/normal_5fc9973d277f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_601737e539bb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417216/normal_6047da18f2998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_60288dbbdf767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470837/normal_5fd7706421eaa.pdfIn PDF document text
    • http://wafixevewitope.mypressonline.com/tusiximenimun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5fe92e8f0b76f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_6041459ec66f8.pdfIn PDF document text
    • http://kusukeluwabe.mywebcommunity.org/97834272282.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/business_management_book_ib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fdebd7ce1677.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/67496149127.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/7183093966.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5fed47fab2a22.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/bartender_training.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_601c914e59388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_43ff996937874d2c972c308cdb68d3bc.pdf?index=trueIn PDF document text
    • http://dusameferadulo.onlinewebshop.net/delegation_process_in_an_organization.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_403c29e8845944e5a6ee9ab690d31c03.pdf?index=trueIn PDF document text
    • http://manuwakagekewu.onlinewebshop.net/zutemidubijizizisabetove.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_b2c4cf9be2b04a689a31bd4c1112ce83.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_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 5360 bytes
SHA-256: d2f7350eec6be03509d5e5ae5ecbe42a6722a1e12ad9855b9be1639ccbb6a137
font_01_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 14436 bytes
SHA-256: 34f8fe1c267550c57db5ac5ad23f774dcbf25adf2f044a205d8dc0a6ea4d46eb