Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c803f041d90596d…

MALICIOUS

PDF

78.6 KB Created: 2021-04-29 14:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: de1f103e46953930bd380ed2ea2f91c4 SHA-1: 431626f2fcaa73a054328fb67be72fcecdad2be3 SHA-256: 0c803f041d90596dea51580eb78552b0cbdff86925a9e5e52024b222074e245d
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://xezojetit.ru/strik?utm_term=epson+wf+2630+print+head+replacement PDF link annotation
    • http://gdztut.com/can_you_upload_to_wix_websitennokc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406216/normal_604062c25e75f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368740/normal_5ffcd8a3b09ce.pdfIn PDF document text
    • http://jedadenawesezo.iblogger.org/clergy_housing_allowance_worksheet_2018.pdfIn PDF document text
    • http://iglivesupportteam.com/what_is_the_best_website_for_learning_englishi54lq.pdfIn PDF document text
    • http://rineset.xyz/first_day_of_school_activities_6th_gradekfhqm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_6011ecce54801.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5fc67232eb19e.pdfIn PDF document text
    • http://revershjtb.site/boduwulkqagw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_600a5ade4ee32.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/bandura_self_efficacy_theoryg3ku7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_a0fc2504e6b14617a096bfdc2c469722.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_0c97c246458a43e287d0bd7f4f32c108.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_9eb8a6cd9d42420789b98a5ff1dd1482.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_c7cb3123ebc64526b33ca501b2e0fc34.pdf?index=trueIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_b6945f62dc1444b2884e5b49a7a3fcc4.pdf?index=trueIn PDF document text
    • http://tupanukaxigazit.epizy.com/raloritokitadivanakoges.pdfIn PDF document text
    • http://vejuzaxifokifo.rf.gd/72047187519.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_c75685364d0d444d98356ac62dfcd780.pdf?index=trueIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_01c5261ea404418393eb5a30324744f5.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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 6036 bytes
SHA-256: 4405ede00ce72aeb257c27f3bc772232604b14f3ddc06dae722cb25133db3829
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 11072 bytes
SHA-256: acdfe6eacee09e1cc3ff8e9afea8f93c938409cfb93cce8754e63fff6bcb5270

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