Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c77dc2577df6fb9…

MALICIOUS

PDF

78.9 KB Created: 2021-04-07 04:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b57f7eb65bffb35893241e5dbde4700e SHA-1: 5c61939b0aea0456efa7a51f1aeb6cfa31d39164 SHA-256: 6c77dc2577df6fb940519fe29abe7bfc97d90e0cf802d7f8f7e6ab3867a89f4c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://midufefew.ru/wix?keyword=fraction+guide+for+students PDF link annotation
    • https://cdn.sqhk.co/zubavagi/6jtEh2J/9467124003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_60588d4638a56.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/gdgfift/smash_it_sports_canada_tracking.pdfIn PDF document text
    • https://zoladikadaxupaj.weebly.com/uploads/1/3/4/6/134635808/1483792.pdfIn PDF document text
    • https://biwopotalar.weebly.com/uploads/1/3/1/4/131438783/lobira.pdfIn PDF document text
    • https://cdn.sqhk.co/vurifozi/gfbIkhf/vivudodijesarujeno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481417/normal_5fe8fe4bcbc70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_6029f1450589d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43e59f28-96d7-4988-bcd6-55bc25f76e69.filesusr.com/ugd/372bdc_672b9b545ced4c358524a105c2355d9a.pdf?index=trueIn PDF document text
    • http://rufegojokod.epizy.com/58789276629.pdfIn PDF document text
    • http://pilojoduzige.epizy.com/45652872721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce9c227-3f88-4b21-bfc1-85785a919368/32187300255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9974745-42e4-4983-b3e3-ff0974035a42/lista_de_habilidades_personales_ejemplos.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_9611a475511440b5875bac940cb5cab2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/700f85b6-cdf2-4f31-a53e-d4cede3a5d6c/enter_the_unknown_star_wars.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_5274fe9a15a8460eb23e7e3d61e08136.pdf?index=trueIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_7a5ccd4fed07424f9cbdc72c70b35aa2.pdf?index=trueIn PDF document text
    • http://mosafipunot.epizy.com/basidiomycota_characteristics.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_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 5112 bytes
SHA-256: 5235febd268c29d0b5a37012e059d99a7068f389dd8b9ea791063394e3b0d20b
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 10796 bytes
SHA-256: 0456956cfdc4e88cae570ef1b71023a83d8615675d56006dc8cb39ef69720b62

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