Malicious PDF — malware analysis report

Static analysis result for SHA-256 10eaeb877604f008…

MALICIOUS

PDF

107.1 KB Created: 2021-02-07 09:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: be806ee4564d15c143c92b358e2b5455 SHA-1: d96d3a1cb7e8618a7b8932ff2e0aeaea078fa6b2 SHA-256: 10eaeb877604f008a728b47e13d85189ce7b4ba4ebc007775d3b5a28ebf48718
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan variant. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect the user to potentially malicious sites, aligning with phishing or content-luring tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=iridocyclitis+treatment+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5fe62cb13bbe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_600a40957fff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_60101efd1c0cb.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/fojKXia/3797872972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427811/normal_5fdee76627bd7.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/Mjcgdip/majetebikusafidagofuj.pdfIn PDF document text
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/zimogexipib_bakulo_taradufikidijil_werevosebejowej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369179/normal_5ff5e4c77fa3b.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/1881440.pdfIn PDF document text
    • https://mikiwugatuvul.weebly.com/uploads/1/3/5/3/135318334/kosolope-japusop-sazikas.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/tuxexi/water_carbon_nitrogen_and_phosphorus_cycle_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/84618471896.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/newanoletezagizi.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/fitasiwoderirizepopusen.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/deshaan_skyshards_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/to_go_simple_past_interrogative_form.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_off000164c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C8 5296 bytes
SHA-256: 137ffc7254f1dcaf22b8edbdfb9b4b6699bd63785554cb4400935f256d2eb307
font_01_sfnt_off000176bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176BC 12320 bytes
SHA-256: 566eefa776c819df1ecbd8e3608f22ed5a43fd01dfb8426da2d59a2a54302f1f

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