Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e9089ae4606c9b…

MALICIOUS

PDF

76.5 KB Created: 2021-04-23 18:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: efe8202203e8f32700858f056551c88d SHA-1: 663aedf53fedb0a110a02e13239b990b09288e70 SHA-256: f6e9089ae4606c9bb58e6c7fce20fb3d1db65fd16f6948743a218241117f7380
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=what+does+black+dog+in+dream+mean PDF link annotation
    • https://palekamenagogu.weebly.com/uploads/1/3/2/6/132682235/7336672.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/bose_revolve_plus_manual.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/zumirubujobuvikipi.pdfIn PDF document text
    • http://ninijefaligogi.mygamesonline.org/furniture_making_manual.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/godonidujuk.pdfIn PDF document text
    • http://tifetatujuvib.22web.org/motor_radial.pdfIn PDF document text
    • http://kulokozataxat.22web.org/bilingualism_vs_multilingualism.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/veterinary_bacteriology_and_mycology.pdfIn PDF document text
    • https://nomikevokatipo.weebly.com/uploads/1/3/1/8/131859895/e1ebe8bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0891a0c1-3058-44b1-9c98-2221519e7b23/97308348213.pdfIn PDF document text
    • http://zewuref.rf.gd/84286912148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad5b76f-45e1-4a4a-bfa5-7b1c7d5d6063/xamegasowagenojelaf.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/take_five_oil_change_san_antonio.pdfIn PDF document text
    • http://nitumajalu.epizy.com/44686495769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/237410b5-333e-4837-9fa9-62d96ee13e49/4336094833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c27094-fb4e-491c-9c87-bcd1b1f45bc2/29140234572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2307a1a-4ab5-4a23-acb4-f226cd6c016a/16812467683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11863ee4-ab10-454c-a0e8-e8bd37ea1d7f/how_do_i_apply_for_a_job_at_lowes.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_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 5568 bytes
SHA-256: 3f70ba6ec1c549313401f9abc215366b9c9ff36f951c948e1a519193065776d7
font_01_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 10948 bytes
SHA-256: 072064f9af83d22ec1a5bc752396b826eb48f7b81ab18d6d7f6e52345c3f6b29

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