Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd0e8e731070826…

MALICIOUS

PDF

67.7 KB Created: 2021-02-19 19:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7a5a36f1ac1fd2a20acbaa7ecf2d4734 SHA-1: 1f424c50014c72f5c8dd89472d48ff338d498be6 SHA-256: bbd0e8e7310708268be230b9648d1e1e5005098720ef873f65b38323363366e8
264 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, indicating it functions as a link farm. Several heuristics confirm this, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. One critical heuristic, 'PDF_MALICIOUS_REDIRECTOR_LINK', flags a URL leading to known malicious infrastructure. The presence of PRC/3D content and a high ML classifier score further support its malicious nature. The primary attack pattern appears to be directing users to potentially malicious or phishing content via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=quote+accurately+from+a+text+worksheet In PDF document text
    • https://cdn.sqhk.co/xaranoraf/cEKQYpY/us_history_quiz_1_quizlet.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/ieggihE/47446293776.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/gHiaahd/bulleit_bourbon_whiskey_recipes.pdfIn PDF document text
    • http://pezidibega.iblogger.org/katyusha_clarinet_sheet_music.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/kapipirux.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/vRjcihs/10565621865.pdfIn PDF document text
    • http://duxogesubuz.22web.org/whatsapp_de_colores_apk_ultima_version.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/ejgbPie/kabosegavitarebekakanuf.pdfIn PDF document text
    • http://xurufotuzu.iblogger.org/baritone_ukulele_chord_bible.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/8504921.pdfIn PDF document text
    • https://cdn.sqhk.co/nazalugewu/ijhegib/35818100294.pdfIn PDF document text
    • http://milafikolume.iblogger.org/43861198221.pdfIn PDF document text
    • https://kupujusurigov.weebly.com/uploads/1/3/4/4/134471221/duxugodod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanesipub.rf.gd/bedazzled_platform_heels.pdfIn PDF document text
    • http://tizovosavudufi.rf.gd/gokomawegaboxupuvame.pdfIn PDF document text
    • http://nepopujadulipid.epizy.com/magic_eraser_sheets_publix.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_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 5508 bytes
SHA-256: b4673c975e49ebe915820229878bcfce38c7284dce7504e9f1bca36abd88c6a9
font_01_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 10040 bytes
SHA-256: 6b22ec30abface302588bad00cd9efa9c828dfc0d8bf2385c01e8ea68be7a424

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