Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6099f6217a699c…

MALICIOUS

PDF

114.2 KB Created: 2021-02-12 04:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 17bd65b9a6aab3e578b5108aa57b3d86 SHA-1: ece987273306ac1005251c998cb741b4054ce392 SHA-256: 7f6099f6217a699c9e6380d944dc585c066ff30308590ecb7a0a39e9b49e33ad
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-themed, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external URLs points to a likely attack pattern involving redirection to malicious sites for payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=cello+tuning+online PDF link annotation
    • https://cdn.sqhk.co/marixefe/hmwxiiM/sazobi.pdfIn PDF document text
    • http://sijojovimem.22web.org/vugajonokobuj.pdfIn PDF document text
    • https://tabetigilazewa.weebly.com/uploads/1/3/5/3/135392987/091032aff.pdfIn PDF document text
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/675e05.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/gfCSOjN/44342368225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nogobixa.epizy.com/dujobotenitulesivuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/38934931830.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/38985318633.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/40952036189.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/86576453322.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/zavomaxe.pdfIn PDF document text
    • http://buwumipulufi.epizy.com/eluviation_as_a_soil_forming_process.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/nabowepisovibudofidunegi.pdfIn 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_off00017f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F43 4272 bytes
SHA-256: 99f54791434342d55bb534b0d58e19805a1faf1c8744e73f315994a510717b1e
font_01_sfnt_off00018de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE4 13984 bytes
SHA-256: b0d778314fee6a26c61b7c69d953b4a12fe0961de87c6c763548f871a32f2fc5

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