Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a0ef16f4b7377b…

MALICIOUS

PDF

76.5 KB Created: 2021-05-10 23:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf4ed975ce9f03ccb18c2c39d3d5e20b SHA-1: 409d85858162555a67d91830168957f4d16866a5 SHA-256: f6a0ef16f4b7377bef9a59195a69e3faab6283de5b9adf18a30d06abb318773c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan variant. The embedded URL and the nature of the link farm suggest an attempt to redirect users to potentially malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=kass+morgan+books+the+100 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fffa1311d448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499653/normal_604aec0cccd7b.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_605d74fd9ee09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497346/normal_606d15930aba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500446/normal_6027f2ec5c7ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5ff776ff25f16.pdfIn PDF document text
    • http://creditscoreusa.info/euro_truck_simulator_2_dlc_scandinavia_product_key_generatorr8s4a.pdfIn PDF document text
    • http://volupixo.mygamesonline.org/49615383154.pdfIn PDF document text
    • http://tegotapiw.scienceontheweb.net/93641168109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5fef5252298cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458137/normal_6005e7fea4dd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411270/normal_606949f767cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_601608cb70711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501229/normal_5fd250582ab98.pdfIn PDF document text
    • http://goromeo.club/blessed_john_henry_newman_rc_college_uniform72i6z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_605da13614575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5fcb6a182446b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_4b6ea0af8e8d401fb988f2ec01149f62.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_7754db06009749c48f2657efeb4c743a.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_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 5436 bytes
SHA-256: 7cb95a693693a9b880a724d036eb0e65a3b9ca632a2b0c3af3ca5afc24d62ebc
font_01_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 10504 bytes
SHA-256: 88dc3eb144aebd1068a0402d7b64c56584bb0e073a9c8da3e83fd403d6075212

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