Malicious PDF — malware analysis report

Static analysis result for SHA-256 536f3e9171e8caa9…

MALICIOUS

PDF

78.8 KB Created: 2021-03-14 10:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae0d9bd7dc861342f97b6a43adde1520 SHA-1: 962e71f47236b0454f92a381032d24da8c6025aa SHA-256: 536f3e9171e8caa9953ce68e3348dc6e5bb9603db6a718e690f28073d8943e86
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 0.9998

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://lozipotod.ru/wix?keyword=watch+got+season+8+episode+4+stream PDF link annotation
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/kudev_vaxiluvizofedi_perigorajojij.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/genufojotoviz_jezevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_602964667c07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_601dada23997b.pdfIn PDF document text
    • http://kufejat.sportsontheweb.net/broken_wings_book_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_60382a1ec962c.pdfIn PDF document text
    • https://pevikotorukob.weebly.com/uploads/1/3/4/7/134708951/7495101.pdfIn PDF document text
    • https://norabemomo.weebly.com/uploads/1/3/0/9/130969424/dunuwopubu.pdfIn PDF document text
    • https://vonewujin.weebly.com/uploads/1/3/1/3/131380349/mokejurapenojex_budokokeluwudaj_pokuruwirofu.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/gawirejot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_6048f04516fda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379034/normal_5ff4f3a241b97.pdfIn PDF document text
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/megiviwidafijigabisu.pdfIn PDF document text
    • https://nogexumojadug.weebly.com/uploads/1/3/4/2/134235638/1175817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_63dca975560e4426974d6d20a5774aa2.pdf?index=trueIn PDF document text
    • http://jabejanaboz.atwebpages.com/33036106311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74265c0c-8a50-4c52-b35a-776496c53926/pemoteliwipeluvikumulekan.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_fc6a2c3f63e04372ad8bc66fcd782258.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a29834-0622-4cb5-9424-7790c2e4489f/tovixezubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c57a48-232e-45b3-b4cf-028148da9ced/45493896974.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/difference_between_equity_and_equality_in_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c277904-f47a-419f-b4da-6c38e41ff8b2/sukifumodapaweruxarasaso.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_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 5748 bytes
SHA-256: 1f194a6c40a66189ecbbcaa66de35e851517af697dc7842ece29c68c7b0dc473
font_01_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 11156 bytes
SHA-256: ae8393980817c0b212f38199b8baa0bc9a21a165660355048fd2ae6bdbd30a27