Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61902acfb81f360…

MALICIOUS

PDF

83.9 KB Created: 2021-03-05 07:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 33fab1d5430ce958df31076f41527023 SHA-1: 4eef2f32e7d175e86aea6948c050d8556af0b470 SHA-256: c61902acfb81f360ad93cf31452819aa63459ddecb4000e2b490be5de2e7a4f7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or SEO manipulation scheme. The primary URL, https://botokaw.ru/123?utm_term=is+350+f+sport+2021+top+speed, is likely a lure to a malicious site or a phishing page.

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://botokaw.ru/123?utm_term=is+350+f+sport+2021+top+speed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414847/normal_6014532b4353f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478127/normal_5ff8edfe77e3e.pdfIn PDF document text
    • https://muxuxinipizo.weebly.com/uploads/1/3/1/6/131637853/mebageno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421472/normal_603185d92ab1a.pdfIn PDF document text
    • https://fizexafotunuguv.weebly.com/uploads/1/3/1/0/131070009/medidowudaj.pdfIn PDF document text
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/3787087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370294/normal_5fecf3cbb1e75.pdfIn PDF document text
    • https://xejevegufukax.weebly.com/uploads/1/3/0/9/130969627/f89446d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_603fa87f065e4.pdfIn PDF document text
    • https://bagubabijotete.weebly.com/uploads/1/3/4/3/134319258/xezeni-kaposuvomax-jutorenadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_60314ab7b36aa.pdfIn PDF document text
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/dupofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_6019c88cdedab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_5fdbda9a58168.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/vUkBKjd/nejukijonusemoriluxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_60095cc97c934.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/mejusewogani-wipuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5fea070b5cfe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_6039fe622fb5e.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/1Dhal1g/quiz_clash_royale_po_polsku.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_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 5344 bytes
SHA-256: 28b678d459e5491844e0fda5213e89d2cfa6cf3531070b4ae3c963667f94e6f2
font_01_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 10716 bytes
SHA-256: 33317485facb1756fa04524e079a92ea1685f177abedaed28267b4dae4b883d9

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