Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0e5d593a0bcf44…

MALICIOUS

PDF

98.7 KB Created: 2021-03-17 03:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a51999e6847296d250f942b6a30c5b SHA-1: df32ebf632a12a9f2890355e4598947db4112b09 SHA-256: ee0e5d593a0bcf44d8fc46c4017962e8f036f1fdcadd87259fe824dd3c5444ed
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=wahl+clippers+set+uk
    • https://cdn.sqhk.co/dadirowuj/hjgjejc/royal_farms_menu_prices_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4383146/normal_60022275a9e25.pdf
    • https://cdn.sqhk.co/letaziseb/a1udnpJ/75071702552.pdf
    • https://cdn.sqhk.co/besiwowegin/ZKghgeP/homemade_wood_projects_for_christmas_gifts.pdf
    • http://libertinemodels.com/how_to_write_a_synthesis_essay_ap_langg82t1.pdf
    • https://cdn.sqhk.co/golemejexeno/ggjgzje/69786227349.pdf
    • http://zelopaqq.xyz/41256548785mk24t.pdf
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5fc827347b0cb.pdf
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5fdf60f708efc.pdf
    • https://cdn-cms.f-static.net/uploads/4472188/normal_6015970a3d8a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8b75f388-5c7c-4b19-8345-865ca307acfb/bose_replacement_ear_pads_qc15_amazon.pdf
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_9afe8e7a62f048bb8ee7c5fe917e1e0e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/62989acc-8a8a-4359-8e7b-d9bb3bb1c177/jipojol.pdf
    • https://uploads.strikinglycdn.com/files/e4e7db71-618b-40d5-afb3-3e3b5f9001e4/63603086877.pdf
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_d26e8ba6f2b44b3b8566ea15f56296e5.pdf?index=true
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_1b107c98e9714badb2c12989b2ac153f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5e56e92f-11db-4d05-b24b-6f56a468771d/51208439642.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_off000131e0.bin
ec19b2535b4cc4d3e2d2177f12c237a292ac52c736f8a4661cb5cb59ecfba8c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 5100 bytes
font_01_sfnt_off0001433c.bin
2d61bc4416fa5e81d6de15314580b90659cb0818d295cf4d114b7aeba1654901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1433C 19336 bytes

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