Malicious PDF — malware analysis report

Static analysis result for SHA-256 84473f0ac31aef7d…

MALICIOUS

PDF

69.9 KB Created: 2021-05-29 14:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04d209451891516e939d95bef52767ac SHA-1: d2c8ffe1062d871bddaa2ca0997099be04d482fd SHA-256: 84473f0ac31aef7d4453d6fc8b87d74e09fe26f424d1e05de6a03963204d368b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farms to manipulate search engine rankings or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. The embedded URL 'https://midufefew.ru/strik?utm_term=how+to+clean+pump+filter' is a primary indicator of a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://midufefew.ru/strik?utm_term=how+to+clean+pump+filter
    • https://static.s123-cdn-static.com/uploads/4427809/normal_5fca1fe8725e7.pdf
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5fefb2e023d89.pdf
    • https://cdn-cms.f-static.net/uploads/4404287/normal_601ffaf576764.pdf
    • https://cdn-cms.f-static.net/uploads/4413583/normal_5fd914ad31ff4.pdf
    • https://cdn-cms.f-static.net/uploads/4425924/normal_6061d42b5fdaf.pdf
    • https://cdn-cms.f-static.net/uploads/4483337/normal_6054f0f771294.pdf
    • https://xuvitekopa.weebly.com/uploads/1/3/2/7/132712193/fewulu_gukogafijewowo.pdf
    • https://vatopefo.weebly.com/uploads/1/3/1/3/131398509/gimox_bejox_botavuvisivul.pdf
    • https://cdn-cms.f-static.net/uploads/4365598/normal_6052d4826dd15.pdf
    • https://cdn-cms.f-static.net/uploads/4461498/normal_6055ad42a42cb.pdf
    • https://mekozatopuwuju.weebly.com/uploads/1/3/4/5/134512494/xiluduzugalut.pdf
    • https://cdn-cms.f-static.net/uploads/4455907/normal_60310364a2dc8.pdf
    • https://cdn-cms.f-static.net/uploads/4379043/normal_605f33ed19ab4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a96846d5-9a9c-42a0-969d-d70105111c4b/70292275474.pdf
    • https://uploads.strikinglycdn.com/files/fe0ee781-1eff-41af-9ee4-60ec171c9da2/83085154911.pdf
    • https://uploads.strikinglycdn.com/files/99329f82-5451-4959-a88a-0f045aaa62e8/kagetipojaxijegadonitedo.pdf
    • https://uploads.strikinglycdn.com/files/e15d3ead-1a89-4cc5-8142-2902e90d7de7/civil_air_patrol_cadet_uniform_regulations.pdf
    • https://uploads.strikinglycdn.com/files/cf49b2f0-3851-4067-8bdb-df13ebcadd63/trombosis_venosa_profunda_diagnosticos_enfermeros.pdf
    • https://uploads.strikinglycdn.com/files/08fd9176-b576-499e-ac61-d0ab43b81232/voxixopejekefogenanuko.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42f.bin
78be65a0f013f8c386ff74a7b8e08f34e0a860dfa20e4f5d1cd28b16ccea258f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 5036 bytes
font_01_sfnt_off0000e554.bin
4222dc9d5eea581f0cf75a4c15a5c4b7351d5505f4cddd2336e8834a7ae751c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 11060 bytes

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