Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bdc090bb9b1988…

MALICIOUS

PDF

79.1 KB Created: 2021-03-19 10:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ffc462e68132d1958e5186ee1bdea217 SHA-1: 8a174366498bfa2dfedad4317d96a0fd44e2484e SHA-256: c4bdc090bb9b1988b39623e47fef2115570f93277e7634063afad94bfb25538d
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=geometry+dash+noclip+apk+android PDF link annotation
    • https://xutezanepone.weebly.com/uploads/1/3/3/9/133999331/861b70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_602e5de60dc52.pdfIn PDF document text
    • http://doucheop.xyz/36654059853z7bme.pdfIn PDF document text
    • http://sallehub.xyz/conversation_casanova_bookfw12p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_6034ef1b84dd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373753/normal_5fe5b966ce3df.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/exercices_corrigs_atomistique_mpsi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_6018a019a5572.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/3082580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415934/normal_60082d4edab4e.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/98609104278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_600ab88f4a0da.pdfIn PDF document text
    • http://itfamily.pro/widorizazwyp3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500674/normal_5fed52211f9de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_60374d647a13f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lapetagalelan.myartsonline.com/tamil_nadu_obc_caste_list_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/housekeeping_maintenance_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/argano_manuale_funzionamento.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_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 5508 bytes
SHA-256: a88ec471df34561e913e56a025e48cf1a49ab6b91d23806b87d4a369fc5d0eb3
font_01_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 14076 bytes
SHA-256: 9d8e967d42debd95d526c79cb52e2d6fc79730bca7b499b06df3de0b3919efff

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