Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef07e1c4b26e9ad…

MALICIOUS

PDF

81.0 KB Created: 2021-05-27 17:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: af89c58ac28e268b50cb57d3db0628b7 SHA-1: 2434ff5036793920089714559242e4e4984419e1 SHA-256: 4ef07e1c4b26e9addb3b4341b480e8c564c909d835f2e51222d22c971adb7456
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous external URIs that likely lead to malicious content or phishing sites. The document body itself contains garbled text and metadata, suggesting it is not intended for direct user consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=valor+esperado+y+varianza+de+una+variable+aleatoria+discreta+ejemplos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426257/normal_60480175b1782.pdfIn PDF document text
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/kuxabefakal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472764/normal_5fee8b8e4fb4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_5ff893e829e00.pdfIn PDF document text
    • https://detatabuloto.weebly.com/uploads/1/3/5/3/135346227/tegofevelegumil-fenug-bomifatolo-jaforegolitage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483833/normal_5fed42f6d7c6e.pdfIn PDF document text
    • https://voxipomawo.weebly.com/uploads/1/3/1/3/131379395/kawoguwutuge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470696/normal_5ff667103840d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_6024f47d38d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463529/normal_602d2ae6d518f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_605bfd464a15f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_604ba1b373299.pdfIn PDF document text
    • https://gubetixe.weebly.com/uploads/1/3/4/3/134314982/xutodat-xifemurabedo-gojirow.pdfIn PDF document text
    • https://kidenido.weebly.com/uploads/1/3/1/6/131636891/3572190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401971/normal_5fc5bbf62eee3.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/ferasabe_surarizonafijet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6013c54ccc8af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab15a16-2e84-4cdf-8067-06d8853ad626/logitech_g900_chaos_spectrum_vs_g_pro_wireless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6934102-27cc-42ef-9fe7-0bb0a8197500/free_fire_hack_version_unlimited_diamond_apk_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1607a966-1f67-45bb-8ed5-3c11e832f8ef/paxafopobaxuzeluvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199b58a2-3fde-4d2e-92b3-7a9cee0cf947/49743082211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db38477e-80a1-445d-b464-1ae035f11fc8/xiwipo.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_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 5612 bytes
SHA-256: 3f574cb4a18aebf9960c6838889bdff9c679c44391be4a845213942f8e0cf964
font_01_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 12836 bytes
SHA-256: ffd043281bbd80e1135d7821aa99b31ef8424447228436355e608f5fad58ea2c