Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49fd561d4c028f9…

MALICIOUS

PDF

71.9 KB Created: 2021-02-25 16:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 39f7cba8c78255fb270f5a06efb0ebef SHA-1: 954adc1d2bbc64696e95920bca6ddbff809c5dd9 SHA-256: a49fd561d4c028f9881c9fbbd80306be1f66617c8bef9191d963e8965cd3d2db
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which is identified as a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to search terms, suggesting a phishing or scam attempt. The presence of multiple links on disposable hosting further supports a malicious intent to direct users to potentially harmful sites.

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=bose+remote+control+codes+for+samsung+tv In PDF document text
    • https://cdn.sqhk.co/ximepadogi/Hhacjfz/ancient_greek_military_formations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415769/normal_600acee544c57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_600f4d7928353.pdfIn PDF document text
    • https://cdn.sqhk.co/suxumeva/3RSLi6u/wabomexojabig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5ff16fe010e69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5feea85f99530.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/aEjaFvx/toginadizofuwa.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/rulilipusexanijase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460063/normal_5fefa8e54d92e.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/agjLKgc/wixuzixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_601b28c7cd761.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/vavejijitatofu/60803101493.pdfIn PDF document text
    • http://gafodix.myartsonline.com/do_airbags_work_in_rear_end_collision.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/nyc_ballet_nutcracker_performance_schedule.pdfIn PDF document text
    • http://zovuzop.epizy.com/36566581244.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/love_mashup_2019_whatsapp_status.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/zefumolederixigobifoxi.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/84388720802.pdfIn PDF document text
    • http://faxaxesaxejov.rf.gd/acer_aspire_a315-_51_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/free_business_income_statement_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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 5452 bytes
SHA-256: 16c4a06b61fd8b8c3891175466394b187cb85ad7619e3dcada88590a257dc20f
font_01_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 10768 bytes
SHA-256: b181af7e86461b5999679dec1f70267ece63eb4d5c52fdcf7bc700ad23d64db6

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