Malicious PDF — malware analysis report

Static analysis result for SHA-256 3892b2f33d1bc47e…

MALICIOUS

PDF

76.4 KB Created: 2021-02-15 15:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6572d6ca27b62abe1b5c97187a93003e SHA-1: 4b24c10d72724c478d9eb4a230e9867d4f0af821 SHA-256: 3892b2f33d1bc47e90962ca6e52049c9acf388ae9b34e49d3daf405c6858c7c4
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=how+to+determine+volume+of+cylinder+in+gallons In PDF document text
    • http://vukosam.22web.org/minority_report_a_nova_lei.pdfIn PDF document text
    • http://pimidemo.iblogger.org/netflix_serie_en_computer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459057/normal_5ff3fd5c6aea2.pdfIn PDF document text
    • http://danivufulof.iblogger.org/mevituseliledokiteriku.pdfIn PDF document text
    • http://csxmoney.info/applied_anatomy_of_upper_limbn159s.pdfIn PDF document text
    • http://graatorama.space/219857826394k1uo.pdfIn PDF document text
    • http://levantemosaic.com/617464550138nqe6.pdfIn PDF document text
    • http://weinmvc.net/spaceflight_simulator_full_version_mod_apk_android_1ib60m.pdfIn PDF document text
    • http://italywow.info/minecraft_pc_apk_1._14y949e.pdfIn PDF document text
    • http://good-production18.site/reading_comprehension_test_2_esoi9n04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/geradi/coursera_financial_markets_quiz_answers.pdfIn PDF document text
    • http://weralawubuzeg.epizy.com/widukud.pdfIn PDF document text
    • http://witopovuketoj.epizy.com/zefimipedefizekizigav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 5436 bytes
SHA-256: 68ef7484a002560a7856d0e2cc6d3a28a480f186410afd039cb1d7a8e2a9af65
font_01_sfnt_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 11504 bytes
SHA-256: 112bf849484152704ec423f0fec3557341d4f8acc4af1a84d92d88089c73c54b
font_02_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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