Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a62c9c7b09e8d0d…

MALICIOUS

PDF

70.9 KB Created: 2021-03-25 18:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2e14d1b86fb91be2f109de8b167ea558 SHA-1: b7e188996deef240340359eb27b9719bfd0cb8f1 SHA-256: 6a62c9c7b09e8d0dc42b2c35a5460ca8dadd38fb8e59de5e604a9daf455942e5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=norwalk+public+schools+calendar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471969/normal_600de9d7b9606.pdfIn PDF document text
    • http://sunny-web.ru/483819218405jdm2.pdfIn PDF document text
    • http://jozozuruju.22web.org/improving_boiler_efficiency.pdfIn PDF document text
    • http://hushseo.online/does_arbys_still_have_2_for_6_french_dipruui2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394072/normal_5ff19b9b1dd51.pdfIn PDF document text
    • http://gufutaca5.xyz/komifugutavafilewobekahbs8x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480148/normal_5fde36a62c53a.pdfIn PDF document text
    • http://phrensy.co/fapexurasorafudibudkhdbu.pdfIn PDF document text
    • http://nibelv.xyz/short_fiction_reading_passages_for_2eoi16.pdfIn PDF document text
    • http://changely.club/define_legal_nonconformityxl6bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450037/normal_5ff188778aea5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vamanufa.rf.gd/detofir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a962d64e-8794-4a7b-aa84-7ff4cb7475ca/writing_effective_sentences_quiz.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_6bea95e736df44fea2bfb030b34bcc39.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_945efb2e986d453ba5fd8dbe18f849e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1e8cf3-b0a5-4364-8088-08a59bf06fa8/61337618562.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_c1d56246150d4c658c744b7b28578e04.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_7a0309a4095347a792e5a3b58cb14548.pdf?index=trueIn PDF document text
    • http://wolaniloko.epizy.com/54681202521.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_0ea4940baae544829662b01357195c13.pdf?index=trueIn 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_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 5424 bytes
SHA-256: 38a616a4cb0ee6ab066be3bc815b59620de8d92a7423dcdc99ed78f63bb1f4d4
font_01_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 11152 bytes
SHA-256: cfe6abf005d024dc260280709a94d7daa8cc78fb64e9aa6d1e7fefd7ec5d171a

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