Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46d076a545b5e15…

MALICIOUS

PDF

77.7 KB Created: 2021-02-21 17:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: db7d7538e8ff0477d54513f43e69f7c6 SHA-1: 048fe6c62713767a938c4bb922929d4344c1aa0a SHA-256: b46d076a545b5e15b919b7a8f81bc76a45d868d7734af3623c8030be4f8bbbc3
186 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. 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://jacksth.ru/123?utm_term=master+cleanse+salt+water+flush+recipe PDF link annotation
    • https://cdn.sqhk.co/kowalaxu/Ao9ggVg/zepewekitiwavibijowilo.pdfIn PDF document text
    • http://promooffer.site/nixapoxidunowasafosevaxat3n1.pdfIn PDF document text
    • http://romomikas.22web.org/27455732344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_602d499d4335d.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/fazizaro.pdfIn PDF document text
    • https://cdn.sqhk.co/terisuzuji/ibhiBjc/sakilikemutuzopa.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/421654.pdfIn PDF document text
    • http://lnstagramverifycentre.com/giuseppe_terragni_transformations_decompositions_critiquesz20bb.pdfIn PDF document text
    • http://oyuncuxx.com/zokobejitomujhgu8.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/cRU7pZS/t_i_slap_kings_hack_appvn.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/YhiKhdr/88837248131.pdfIn PDF document text
    • http://reduslim-italy.site/audi_q7_manualyrgdg.pdfIn PDF document text
    • https://vovikadu.weebly.com/uploads/1/3/4/5/134587732/tanelasefurekajo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pegagudebamu.epizy.com/let_me_tell_you_about_the_birds_and_the_bees_lyrics_and_chords.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/my_fitbit_display_stopped_working.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_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 5200 bytes
SHA-256: 56b9af1cfe260142130af25922d6e3aedbe7ef2f5fa2d214d501263e0b159b15
font_01_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 11016 bytes
SHA-256: 64b974b03245cec6fda457e41a13f71a1485a86cecf7b5c399e02de12983431c

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