Malicious PDF — malware analysis report

Static analysis result for SHA-256 6852b190706ae97e…

MALICIOUS

PDF

88.4 KB Created: 2020-12-28 11:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40b923ccad0afda990a01f69cf2a9348 SHA-1: 15b33dbe091d912df2fe0096ec3886f4a35af0cc SHA-256: 6852b190706ae97e0bf6700b235d9a3424af8b9f1162f6da931fef1ea436c1cc
186 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 disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://trafficel.ru/123?utm_term=right+triangles+and+trigonometry+worksheet+answers
    • https://tavovoxiwazufaj.weebly.com/uploads/1/3/5/3/135325502/jojexutebevoze.pdf
    • https://rawixokuboja.weebly.com/uploads/1/3/4/0/134097397/1072621.pdf
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5fa5a05f7d901.pdf
    • https://lesajevix.weebly.com/uploads/1/3/4/3/134318042/gugap.pdf
    • https://static.s123-cdn-static.com/uploads/4422148/normal_5fc3b5b0e9afd.pdf
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/5a996f3c.pdf
    • https://cdn-cms.f-static.net/uploads/4473902/normal_5fe796059d3f8.pdf
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/2770046.pdf
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5fba7f40a86a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/81526956-3796-4e14-81f6-176d98d39b34/desurutog.pdf
    • https://s3.amazonaws.com/fefurorobumi/39069823640.pdf
    • https://uploads.strikinglycdn.com/files/583df1d8-887c-49d1-9713-483be2e4f699/doxalufa.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112c5.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 2828 bytes
font_01_sfnt_off00011cbf.bin
00336ac6bdfe7341591e80bc6e2c94980cdeb7dcd20eb6827bcb2e3cf43964b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 5504 bytes
font_02_sfnt_off00012f65.bin
f618dcf3c901db3e4c1f834995845e1509ad71d1e52028561fcf37d50ee8cbcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 10176 bytes

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