Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ae49a1aa926e2f…

MALICIOUS

PDF

108.4 KB Created: 2021-02-18 17:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 50bdf3c0981afc7f7a4f506b957e5968 SHA-1: e093e5cdf69cc430d9d7717d1fe0ab34d731ccc9 SHA-256: c6ae49a1aa926e2f37de53b7114e9056cc21279d4ee32a8d1d81c6543ee4ffbd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and Weebly subdomains, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to malicious sites.

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://leonvi.ru/strik?utm_term=how+to+drive+a+13+speed+eaton+transmission PDF link annotation
    • https://lomizagufefeg.weebly.com/uploads/1/3/4/0/134096038/jutapum.pdfIn PDF document text
    • http://keto-menu.online/wodemalzz5sl.pdfIn PDF document text
    • https://cdn.sqhk.co/jepipovi/gfieZsa/nda_agreement_template_free.pdfIn PDF document text
    • http://ovca.space/20817398066tflyq.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/7sxnihr/20638298314.pdfIn PDF document text
    • https://bogagabav.weebly.com/uploads/1/3/5/3/135305267/409fafff0b854.pdfIn PDF document text
    • https://menufaron.weebly.com/uploads/1/3/0/7/130775522/xutedunajulilefuz.pdfIn PDF document text
    • https://dotozirijekuzo.weebly.com/uploads/1/3/4/3/134315872/1754305.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/jidavepuwelun.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/nejod-paveti.pdfIn PDF document text
    • http://vinnipoh.fun/28058676739jess3.pdfIn PDF document text
    • http://nasporte1.fun/2933172237zl27r.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/9191031.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_off00016bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BCB 5404 bytes
SHA-256: 20e7d5d025ed8be98f00066343c50d9ab4d517e6fbc6da19cafb04cfec82c5d4
font_01_sfnt_off00017e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E31 11232 bytes
SHA-256: 1acece106d8a58112ecd309bbc9769acabdcffbb5d15f4b569e3fd3ea8e4f7d3

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