Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3b18334610d806…

MALICIOUS

PDF

75.0 KB Created: 2021-04-08 06:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: daac4ba79bcd4ce207c433e637c639f7 SHA-1: b172bf1b4577d02fa73e1e2b48b1ddf7c29624d1 SHA-256: ed3b18334610d806ad7cc175ae2c0d0347745c04a73a9f14f083a8c7f96ff79e
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malicious redirection attempt. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to checking internet speed, serving as a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/123?utm_term=check+internet++speed+online PDF link annotation
    • http://ek-arenda.ru/animal_dichotomous_key_worksheet8kbtp.pdfIn PDF document text
    • http://pycnidwzxc.info/36906655189lnty5.pdfIn PDF document text
    • http://hermidkovo.info/laboratory_manual_for_principles_of_general_chemistry_citationptpj0.pdfIn PDF document text
    • http://www19216801.site/37875336114ccyig.pdfIn PDF document text
    • http://creditscorerepair.info/gomumojafawibesetaxud7p93o.pdfIn PDF document text
    • http://wugafis.66ghz.com/383891243.pdfIn PDF document text
    • http://tokio-2020.fun/how_much_does_1_large_sweet_potato_weightsz14.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/67521552568.pdfIn PDF document text
    • http://bulenamoj.22web.org/examples_of_epithets_in_beowulf_with_line_numbers.pdfIn PDF document text
    • http://karnaval.host/85438626275x580f.pdfIn PDF document text
    • http://mazafaka69pussy.online/fazufuvuwiwokasudepunel34vl0.pdfIn PDF document text
    • http://mutetufowikujib.22web.org/soxumufinavugoluno.pdfIn PDF document text
    • http://ramuwazezu.22web.org/aldol_condensation_project.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukilik.epizy.com/86183506649.pdfIn PDF document text
    • http://wedizakur.epizy.com/24629964903.pdfIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/47645261621.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/pioneer_deh-1300mp_wiring.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/what_high_school_classes_should_i_take_to_be_a_dentist.pdfIn PDF document text
    • http://gozuxinub.epizy.com/aramaic_english_new_testament.pdfIn PDF document text
    • http://nonidimujosapa.epizy.com/21118002871.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_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 4920 bytes
SHA-256: f96b41916b37e2264f6c49de507feda38dfda5f6f192464a9c22f86298cd845a
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 10336 bytes
SHA-256: 2d8052489798b2a8d11294783c74295be1d81aaeca00ada8ae733f31d9393863

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