Malicious PDF — malware analysis report

Static analysis result for SHA-256 8175a710d6f40c96…

MALICIOUS

PDF

117.1 KB Created: 2021-05-29 08:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f010b27a85cb5982130fbc7284127950 SHA-1: d80bec7258cddd3852cb7338c26d290dee6409bd SHA-256: 8175a710d6f40c964e326918457b00ac35c2804b5ef3d39f6ba5659b2e36a9e7
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 0.9997

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://zajinet.ru/123?utm_term=guild+wars+2+pvp+guide+2018 PDF link annotation
    • https://zopopalolidipe.weebly.com/uploads/1/3/4/5/134500843/e11463f0.pdfIn PDF document text
    • https://zegusuvi.weebly.com/uploads/1/3/4/7/134738546/e1876.pdfIn PDF document text
    • https://nefalitarula.weebly.com/uploads/1/3/4/3/134308949/jokemikemokesovim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486963/normal_5fde7e13c8af3.pdfIn PDF document text
    • https://sakedupepig.weebly.com/uploads/1/3/4/3/134355988/vokobuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415321/normal_5fd9f805780c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446930/normal_5ffbd8528677c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_6047518a7a906.pdfIn PDF document text
    • https://wireluxibesoz.weebly.com/uploads/1/3/4/4/134402736/439957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501361/normal_5fd76e66a9c12.pdfIn PDF document text
    • https://waderiraxobo.weebly.com/uploads/1/3/4/5/134505054/3430777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5fe6ed8e98946.pdfIn PDF document text
    • https://zosufolukariv.weebly.com/uploads/1/3/4/7/134755865/rotovapemerive-mulas-bigeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_606491893bc80.pdfIn PDF document text
    • https://fegibaja.weebly.com/uploads/1/3/4/3/134305779/kupika.pdfIn PDF document text
    • https://vesokawewewavi.weebly.com/uploads/1/3/1/3/131382886/2bfee46750e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_605e1dfc39157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465267/normal_5ff086ca5174d.pdfIn PDF document text
    • https://felomadexibeb.weebly.com/uploads/1/3/4/6/134687620/mifuze.pdfIn PDF document text
    • https://vavirewafikeja.weebly.com/uploads/1/3/4/4/134402836/a8eb58ec5ecaf.pdfIn PDF document text
    • https://lovuzuligo.weebly.com/uploads/1/3/5/3/135315796/bumawen-wamipe-gajazatofaza-nadimun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000179dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179DD 5828 bytes
SHA-256: 8c56a2ba8c84d4c77aabec5808f6de75ed2955e0de1abe4338a4dcf8e5050bc3
font_01_sfnt_off00018de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE6 18404 bytes
SHA-256: be60bd85ef2a7a92e5e4532590a363a990a102899470b154c317057011195a91