Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57814a7b4ea0cbd…

MALICIOUS

PDF

68.7 KB Created: 2020-11-26 18:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b9ecf75df3f4d41bbe406e5e2f6022c9 SHA-1: 1c49cd47360f900def4bec36b02dff19e09d76b3 SHA-256: c57814a7b4ea0cbd3e1ccda051dec77efdb7e2782a3b3f603ef999bb4baa1dca
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to what appear to be SEO-optimized PDF documents, suggesting a link farm or content stuffing tactic. One of the primary external links, 'https://traffking.ru/123?utm_term=finance+theory+group', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=finance+theory+group PDF link annotation
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/vesefotim_toxopadolifipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_5fbb032c1f47c.pdfIn PDF document text
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/341236760d13ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5f9db3eb234d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486534/normal_5fb46c9baff87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/cold_war_superpowers_key_terms_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/25217044115.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/25787862740.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/zaxijegulidasomogajew.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/taxonomy_key_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/puxuvizifotoboxomibomig.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/46572558725.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_off0000c950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC950 5040 bytes
SHA-256: 9243e03c98501fa2c224c297ac7481f8addf4b85d12889b34346960c87aacc7d
font_01_sfnt_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 14104 bytes
SHA-256: 77190c60bb27050048fe015257ba73ebfe42e00de8c9981cd680918fec18b0ad

Open this report in the interactive analyzer, or submit your own file for analysis.