Malicious PDF — malware analysis report

Static analysis result for SHA-256 815ae03bf2f215e8…

MALICIOUS

PDF

78.7 KB Created: 2021-03-31 15:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 118504754f12ba445ddfc98989b1e17b SHA-1: c69f78a305729390a5d59c4ed96d8abf1fe789e4 SHA-256: 815ae03bf2f215e850b2ff92bebca41c46a5772540b47a7980487ec7c78b91ae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to software nodes, likely a lure to attract victims.

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 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://bologen.ru/strik?utm_term=how+to+remove+mental+ray+nodes PDF link annotation
    • http://bumasujofoj.getenjoyment.net/1986_gas_prices.pdfIn PDF document text
    • http://wupunekum.getenjoyment.net/46341581717.pdfIn PDF document text
    • http://bovinuxunegobi.iblogger.org/bufawoxomifimiguwixide.pdfIn PDF document text
    • http://grafoanaliz.ru/vonijeniluximbrtqw.pdfIn PDF document text
    • http://housefashion.ru/calculating_acceleration_worksheet_middle_schooly2211.pdfIn PDF document text
    • https://cdn.sqhk.co/ziveluki/iizGiiA/rofiregolib.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/fgeEjIX/fiwagazobozu.pdfIn PDF document text
    • https://cdn.sqhk.co/laratakidev/Iia8bjh/s3_bucket_cloudformation_template.pdfIn PDF document text
    • https://cdn.sqhk.co/lekifuwixal/tgdhcgi/91760743874.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/writing_an_academic_journal_article.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wedutatitupaze.epizy.com/xarafokinawilonegif.pdfIn PDF document text
    • http://zutagisite.epizy.com/81003954253.pdfIn PDF document text
    • http://manuwakagekewu.onlinewebshop.net/2655427632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d37320d-5402-44ce-905e-ff05979824e9/53139748759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498f7d58-aa8b-4f30-9497-009238a3a03a/91313317659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a78900-faab-4e05-94a5-5a834a5d4873/workouts_in_intermediate_microeconomics_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/527fa02c-31ea-4967-a745-45ddde622145/horton_hears_a_who_characters_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d249505-377d-491d-b789-6135a44ac697/83631526728.pdfIn PDF document text
    • http://pigosegekezejol.epizy.com/galarulovam.pdfIn PDF document text
    • http://naxezutozotos.rf.gd/manujazorux.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_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 5184 bytes
SHA-256: 4705f6a649cb5606b6360a78f9531fb358db47c92248ee1f6a1d85b476422faf
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 11500 bytes
SHA-256: fd45195b509632b544d3b5fca8fe1ffbb72673567d2a41c836ce34d4a3a203c0

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