Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1e19745f90de17…

MALICIOUS

PDF

75.1 KB Created: 2021-02-19 14:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 47cf7df9426ecf5e8d73d449c83494ef SHA-1: e2c8eb1cd14c9d04ef9dd9c9fa49d2dc865263d6 SHA-256: ec1e19745f90de175aae6d331bf890daa83c05034a5afa13ed2f0d6f0aa07fdc
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to potentially malicious content. Heuristics confirm the presence of malicious redirector links and a link farm, with ClamAV also detecting it as a phishing trojan. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://crophysi.ru/123?utm_term=best+black+friday+deals+on+beats+by+dre+headphones In PDF document text
    • https://cdn.sqhk.co/golemejexeno/Jget2hj/zadejoxigibatidovakitodi.pdfIn PDF document text
    • https://ripumoravoramex.weebly.com/uploads/1/3/1/6/131606135/tusivevafuwusex.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/Gi8fFgj/sitasi.pdfIn PDF document text
    • http://kanshoper.site/127581262755g0v1.pdfIn PDF document text
    • https://betunujaxub.weebly.com/uploads/1/3/1/6/131636576/e264b.pdfIn PDF document text
    • https://takupomowemeb.weebly.com/uploads/1/3/5/3/135314116/8129645.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/UDmRAjX/mikuruguzituwujulafup.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/gijlqgc/sonic_adventure_2_chao_evolution_guide.pdfIn PDF document text
    • http://exemplpusj.com/opera_vpn_apk_pro8mc6r.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/uAgfjdX/kamise.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/RjiMpgh/mnemonic_dictionary_fastest_vocabulary_builder_app.pdfIn PDF document text
    • http://nefritthebestthing.site/easy_fingerpicking_songs_tab01nuc.pdfIn PDF document text
    • https://rabavuvorek.weebly.com/uploads/1/3/1/0/131070866/1054374.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/tawosutosuxi/ruvalokiwesujisalibawa.pdfIn PDF document text
    • http://kafofatetijusow.epizy.com/mepesewejimeferiwut.pdfIn PDF document text
    • http://disidigepaxu.rf.gd/desarepibiberavemexepuzu.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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 5600 bytes
SHA-256: 8b18350a049e54fbd8f37ebe783685920c76428bcf2b7ec7ce06b241b0e7756c
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 11252 bytes
SHA-256: 704543ef78145901b9d591fec52e5d9bc808c26e1dc0d3515d045113400a4a66

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