Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa4dc3949169858…

MALICIOUS

PDF

78.6 KB Created: 2021-03-02 02:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7ab21d23419f32b5b5bad53e36839a3a SHA-1: 7ae4240efbbcf6e3cb110d1336c0ef97d0ed2f0b SHA-256: baa4dc3949169858bfcde29c0ed2a4d6d30e6db311bfa74cf985de5eb863e08e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://ponafet.ru/strik?utm_term=what+happens+at+the+end+of+the+sense+of+an+ending PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475725/normal_5fd9c246d6e64.pdfIn PDF document text
    • http://hookup754.fun/55007631113ej48p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_601021231546b.pdfIn PDF document text
    • http://anyita.space/431993790962zrx5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_601b28f380c14.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/latin_legal_term_for_precedent.pdfIn PDF document text
    • http://maewallace.com/bowadabomawutebowefolixo4cay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_601d021347ca9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xibiwoziveva.epizy.com/7985090780.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/jiliwofebopokor.pdfIn PDF document text
    • http://wiwugaku.epizy.com/27999401292.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_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 5188 bytes
SHA-256: 3c50420d828530ba2065da866bd7b5110fffaa8f392986f66f18fdf1306244fe
font_01_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 10436 bytes
SHA-256: 096b7d4e13ff8667aa5c0afc7184641fb4fa62ae465951592fea3434b7f8db33