Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b2809a3e5f32a0…

MALICIOUS

PDF

84.6 KB Created: 2021-03-02 21:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b91fb1a94da674724eaed891fbefb584 SHA-1: de402442b746cf7ae820cad3e42765828010c5aa SHA-256: 57b2809a3e5f32a0cca533edaf98cc90b0dace97d1569e7ea65e224dc379651a
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=sharepoint+online+user+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/busoleva/IghpzvG/viridiana_martinez_gonzalez.pdfIn PDF document text
    • https://cdn.sqhk.co/konanetufuda/Bheijjf/72198032069.pdfIn PDF document text
    • http://mavpa.fun/bekal_fort_information_in_marathiend5w.pdfIn PDF document text
    • http://emmetrix.net/721154814084urw1.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/3289155.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/hhgCojb/29016361413.pdfIn PDF document text
    • http://goodsun.space/troy_bilt_econo_horse_tiller_manualeg56g.pdfIn PDF document text
    • http://idealicaitalia.website/90554226527fmj6r.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/hcgfltM/rapunzel_cast_flynn_rider.pdfIn PDF document text
    • http://checkmycredit.info/jabra_Bluetooth_Mteri_Hizmetleri_ts7ild.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwegamuvev/hGmji3r/onelogin_protect_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/Nicc2ja/2537700037.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/YEFghjb/english_song_lyrics_download.pdfIn PDF document text
    • http://megalit-korolev.ru/optimize_size_free5o59n.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/wizakokowe/famous_english_short_stories_with_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/certified_ethical_hacking_course.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_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 5404 bytes
SHA-256: 2a064426c936f1607dd982acbebc288f3ecba7957b13af5097fe42833fedf475
font_01_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 11420 bytes
SHA-256: f906ba84fc52fbe7f579ecccae2e749a70627060b5cba1970c53e2e9dde7082d

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