Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c72e6b56a626f7e…

MALICIOUS

PDF

79.4 KB Created: 2021-03-27 18:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: db70670781071778b1db59e6a8fa3a56 SHA-1: f5b222873c26ee60f399ab23d64c486d1053c229 SHA-256: 9c72e6b56a626f7ead0863ac52378aea4f179638737fa3889e4866928e237ddc
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a link farm heuristic supports a phishing or malware distribution attack pattern. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://nipisod.ru/123?utm_term=diastolic+hypertension+treatment+guidelines PDF link annotation
    • http://chambre.xyz/afghan_jalebi_songs_pagalworld7xwec.pdfIn PDF document text
    • https://moxeguzivega.weebly.com/uploads/1/3/5/9/135965209/sagefelejapoxag.pdfIn PDF document text
    • http://raisinshub.pro/bums_syllabus_2017o7rs5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5ffd86de699a5.pdfIn PDF document text
    • http://doucheop.xyz/36654059853z7bme.pdfIn PDF document text
    • http://sallely.xyz/ruroxiviputuxivh7dyn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_6045140c4ee8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_601ca94724e3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480899/normal_6007bd360be86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464530/normal_60464b20db254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479223/normal_5fc8ee39d227e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_5fe7b6cf4f178.pdfIn PDF document text
    • https://libepuve.weebly.com/uploads/1/3/1/4/131407284/3ae8050678fdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474988/normal_5fe51d3e6658a.pdfIn PDF document text
    • http://linza.media/chemistry_an_atoms-_focused_approach_downloadnde0g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_603801c22df1e.pdfIn PDF document text
    • http://rulabalelenifop.iblogger.org/pidemodejuxapamedalaxemon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jevelel/44451739505.pdfIn PDF document text
    • http://wefexafunedex.epizy.com/roxijetupepiwelonemo.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/cement_brick_making_machine.pdfIn PDF document text
    • http://dutagewenurodub.epizy.com/ledatup.pdfIn PDF document text
    • http://jiwodasovizo.rf.gd/85767873386.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/4101384747.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/hundred_islands_travel_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/scientific_method_practice_worksheet_answer_key.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_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 5588 bytes
SHA-256: bcb3609cf1e1201a0d1994e72f7a552c68b8c1874fd33542d62effed7771a0ef
font_01_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 10964 bytes
SHA-256: a3e5b4805131b78f39e2468d492a8494ac67324cc5c93631a8dc9df7e4d1e168

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