Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b8faa4b180680a…

MALICIOUS

PDF

70.0 KB Created: 2020-11-23 11:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 244a33234c15b23d602ba7f519ec039e SHA-1: d4a397180f4444594e4537c2f216c4ec1b168e4f SHA-256: 88b8faa4b180680a1ed9a1fb147c5ca0d5a0ffd5a9f288d05c68565033d92e3b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=textbook+of+pediatric+emergency+medicine+2010 PDF link annotation
    • https://totapige.weebly.com/uploads/1/3/1/4/131483287/7994923.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/b64060c55.pdfIn PDF document text
    • https://bamaxasujobuz.weebly.com/uploads/1/3/4/3/134315865/rafogeka-nenalozirapil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_5f9ef8adb92fa.pdfIn PDF document text
    • https://rapexukiwivusa.weebly.com/uploads/1/3/4/8/134856806/a1e1ca7dcf16f76.pdfIn PDF document text
    • https://kasozufadoji.weebly.com/uploads/1/3/4/5/134523760/zevelot-fojilozukefe-kusavibuxurex-medipipudo.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/7727616.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/78969f45-8c67-40d7-af0b-40f8e451c4e0/Kinder_xnxx_com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddd3d87-62a1-4274-ad72-c1469cc3c64e/memafitisonivijevaxolaja.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/mirakunokezitudamolose.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/population_and_community_health_nursing_6th.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40ddfc8-1be7-4a18-999e-ad8067acb22c/what_is_after_million.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/44028937189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafb9a25-ca77-4253-a116-d1f6aac87b8d/kingsman_2_full_movie_in_hindi_download_hd_filmywap.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_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 5912 bytes
SHA-256: c0dc1254288a9beb11de8023470885599c912061f16730f9ad79dea4f827f015
font_01_sfnt_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 10156 bytes
SHA-256: 1383729e912752479083eda006cb0850fce7558964e38c33255f4fe30f0a554d

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