Malicious PDF — malware analysis report

Static analysis result for SHA-256 738c56a36d07859a…

MALICIOUS

PDF

85.4 KB Created: 2021-02-20 19:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: faae48dcafaf638aedafbc9a06e0db4f SHA-1: 2bba0cfbc4a10dc218d46af1f3830ebd568c958f SHA-256: 738c56a36d07859a3b0a24c2b3eb37f6d22b4138e3f78afd40cf65a56afe4dd0
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery. No scripts were extracted, but the PDF structure itself is weaponized for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://crophysi.ru/wix?keyword=smile+by+raina+telgemeier+pdf+download In PDF document text
    • https://cdn.sqhk.co/rowazazapa/5gejfPH/94035752770.pdfIn PDF document text
    • http://zowutelufuga.iblogger.org/42091614361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_600a09920c24d.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/umDK2ji/29346622808.pdfIn PDF document text
    • https://cdn.sqhk.co/sajixobuko/gd0icYh/83602504660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_5fd8e7717756a.pdfIn PDF document text
    • https://cdn.sqhk.co/tugadeboda/fYgcuhe/what_is_ding_dong_ditch_on_facebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_601955f2c32e3.pdfIn PDF document text
    • https://cdn.sqhk.co/manowipete/hiCheid/53478746231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_5fda92009dba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5fc7bf31a23f4.pdfIn PDF document text
    • https://cdn.sqhk.co/kamepixuxuk/abimEPH/magic_poser_pro_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5fc8faa233e8a.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/gjuqA4T/2012600937.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/iggehio/skins_for_among_us_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_601db31bee6c4.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/fjhKhcZ/mevurakadipuxenatemiwifus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://katewamopexo.rf.gd/75315690667.pdfIn PDF document text
    • http://jefesati.rf.gd/best_animation_software_for_windows_10_free_download.pdfIn PDF document text
    • http://lojosikol.epizy.com/word_template_labels_21_per_page.pdfIn PDF document text
    • http://kodadus.epizy.com/knowledge_base_article_template.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_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 5620 bytes
SHA-256: 0247b2e67c81b484cd6b02279dfaddb46fcb408da37ae0d50252a494ca169cdf
font_01_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 11212 bytes
SHA-256: bb806be4ed655253960c7b20cec5b1b26e360e7e67761b2c684af1d64d817876

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