Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef58eff1a683eab3…

MALICIOUS

PDF

73.5 KB Created: 2021-02-18 14:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 922daffd148b36c471c7de1ea25bdad7 SHA-1: 5dd325a808c1855b545b0d280bfb0c8df9a14aa5 SHA-256: ef58eff1a683eab31963171bad7062c8909521540e246a0af6dafd4671159e04
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on external domains. The primary malicious URL, 'https://baarspo.ru/strik?utm_term=on+the+incarnation+quotes', is likely used to redirect users to phishing content or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baarspo.ru/strik?utm_term=on+the+incarnation+quotes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374540/normal_600041f22b6c6.pdfIn PDF document text
    • https://cdn.sqhk.co/rovonoset/hc8B4UI/gobebekobopisofusize.pdfIn PDF document text
    • https://runuwafulisejet.weebly.com/uploads/1/3/5/3/135337902/koporib_sikuxogupi_duxuwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5ffb842ebe7b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419828/normal_6008ac63900f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_602307ecdb0f0.pdfIn PDF document text
    • https://xadonuxezi.weebly.com/uploads/1/3/4/1/134131919/mololejal.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/2iccGjq/tile_floor_installation_calculator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_5fe06d654e73d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406229/normal_5febd3962046b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506159/normal_5ff1c235b4aa5.pdfIn PDF document text
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/solifobaminirezurana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_6012c9a231589.pdfIn PDF document text
    • https://tutitobogin.weebly.com/uploads/1/3/4/4/134485970/9590165.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/jawusawar/nccn_guidelines_2017_thyroid_cancer.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/92867315715.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/3819331310.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/duzofilatisavisilulufeze.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_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 5008 bytes
SHA-256: 7f3b1cf4a59be2cced7b2683febd1bfe59f0808a3a18d0ef0b3848511ae1fcd3
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 10640 bytes
SHA-256: a41806a9d167cb0d80e5388e7eaca76aeb21634c0755444b6c75f30d303d6ec8

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