Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a7ac231b203f96…

MALICIOUS

PDF

67.6 KB Created: 2021-06-03 07:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e4241e9a962a5e781289228f12cd638 SHA-1: d09023b8fde205ecaa350c0001177f867d063d8b SHA-256: 26a7ac231b203f9618bcca42ac994465fb1c71f8c304a96183ebe2ab16f35cc7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/pbw?utm_term=taco+571-2+zone+valve+manual
    • https://static.s123-cdn-static.com/uploads/4365551/normal_5fe3ddf5e5a77.pdf
    • https://bifutizuwosedi.weebly.com/uploads/1/3/4/6/134645412/827e0317116.pdf
    • https://cdn-cms.f-static.net/uploads/4483836/normal_6069be4dad944.pdf
    • https://static.s123-cdn-static.com/uploads/4468563/normal_60056147398dc.pdf
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/39fd968a069534b.pdf
    • https://nowefatitabawev.weebly.com/uploads/1/3/2/7/132740181/kafetimekejol.pdf
    • https://cdn-cms.f-static.net/uploads/4418365/normal_600f3907bb4a4.pdf
    • https://cdn-cms.f-static.net/uploads/4387232/normal_60273d8da8377.pdf
    • https://vefotufujipewux.weebly.com/uploads/1/3/4/4/134401009/8e7daa4c.pdf
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/172afa4695812.pdf
    • https://kadutazufe.weebly.com/uploads/1/3/4/6/134639852/voboz.pdf
    • https://cdn-cms.f-static.net/uploads/4420924/normal_603444b1ac76c.pdf
    • https://cdn-cms.f-static.net/uploads/4506159/normal_606d7e219179f.pdf
    • https://cdn-cms.f-static.net/uploads/4452852/normal_600bd1e2116a7.pdf
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/9117863.pdf
    • https://static.s123-cdn-static.com/uploads/4403541/normal_6005f05e48c84.pdf
    • https://pijezokonogoxa.weebly.com/uploads/1/3/4/3/134308979/zodaza-wokiwagifutilik-mukod.pdf
    • https://cdn-cms.f-static.net/uploads/4490736/normal_604166f793d73.pdf
    • https://cdn-cms.f-static.net/uploads/4389797/normal_60305636f01df.pdf
    • https://xuduburuk.weebly.com/uploads/1/3/4/3/134323667/kejudusoterezozije.pdf
    • https://vakurizilobiwil.weebly.com/uploads/1/3/0/9/130969742/zujegufob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccbf.bin
2bab619731b71945ca39a66e4dbb5c170450845a35532d2f2a0daacb4efae8ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBF 5148 bytes
font_01_sfnt_off0000de5d.bin
93f00af02ebe1ea7e8048c9a013da7dfe8e3fc5831d0f5bcc878a4b02058ab72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 10280 bytes

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