Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ddc45cdd7576a7…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 11:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 23476b2f58f084bb46a2d43b7e362243 SHA-1: a395774f989f2a691c81347c0124fca0121ec9bc SHA-256: c5ddc45cdd7576a7aad60a0fda82bcabb7855e0a459e5d65802310053795d28f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary focus on a link farm designed to trick users into downloading files, indicated by the 'blues+for+mister+charlie+pdf+download' UTM parameter. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a malicious payload or redirect users to a phishing site.

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://jottigo.ru/123?utm_term=blues+for+mister+charlie+pdf+download PDF link annotation
    • http://getfreecreditreport.info/90308557495uv2bz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_602e704aaa8b7.pdfIn PDF document text
    • http://apkweb.net/epf_online_form_2019wgz6u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481280/normal_602730da0232a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381344/normal_5fc60176cac7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386363/normal_5fcff4124c1ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472495/normal_5fe60d51d7024.pdfIn PDF document text
    • http://jushq.pro/piano_adventures_primer_theory_booklubzw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499341/normal_602b067a45cb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383698/normal_600937678d276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462688/normal_5ff3dbc167eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_6031bc03355ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_6011335ecdafb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5fce0392c2ebc.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/punurum/ruripon.pdfIn PDF document text
    • http://sixanuramusasit.epizy.com/simple_control_chart_template_excel.pdfIn PDF document text
    • http://bosulug.epizy.com/harley_livewire_specifications.pdfIn PDF document text
    • http://guzedero.rf.gd/items_terraria_guide.pdfIn PDF document text
    • http://zevofelajasuz.epizy.com/megazegesobikot.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010190.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10190 19912 bytes
SHA-256: 6927c4027d9de2082faaddd0f058aeca0aad828a99875fab5afb818ab63b2fb0
font_00_sfnt_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 5536 bytes
SHA-256: 57b7da11beb25229d03d0658a0675e7ccb8eb1a720d8b035e6cf139df17cc6ca
font_01_sfnt_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 10344 bytes
SHA-256: 43a6337e67cd405b49cfd0c3dfa10efea1caaccf5ca21d7ace807cdfcc043220

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