Malicious PDF — malware analysis report

Static analysis result for SHA-256 8beea26c8c85f642…

MALICIOUS

PDF

85.3 KB Created: 2021-03-17 14:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b2b8fcd37073cc9e094c7f296858914e SHA-1: 18be71c2442b5ea160cb839af7ebb7bb70eaea84 SHA-256: 8beea26c8c85f6420bf68e9cbb567ee7cfb0aa92206588c38ccd4afb997dad5a
184 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting and redirectors, indicating a link farm designed to obscure malicious destinations. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/wix?keyword=why+did+islam+spread+so+quickly+answers In PDF document text
    • https://cdn.sqhk.co/bofadulal/6jbihoN/pudebereradigetaweganapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_602ff0706a32a.pdfIn PDF document text
    • http://kikebumanexewuj.22web.org/19151360859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_60297cb0b8cd3.pdfIn PDF document text
    • https://cdn.sqhk.co/sesekopusoj/MpgcgcN/menosego.pdfIn PDF document text
    • http://libertinemodels.com/63623048567aclxb.pdfIn PDF document text
    • http://xugerovogubex.22web.org/largest_information_technology_companies_in_europe.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/eCu2NJZ/32612903884.pdfIn PDF document text
    • http://stroymarketmetal.ru/93596631358u04uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475197/normal_5fd89e23e1a15.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://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_3fd830bf395a42e1a7dd9de87edd3d9e.pdf?index=trueIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_9bbf9d2d9f7d425f887ff71fabd40c97.pdf?index=trueIn PDF document text
    • http://kebowikosu.epizy.com/3935142299.pdfIn PDF document text
    • http://difesasud.epizy.com/37765654725.pdfIn PDF document text
    • http://sogefotasir.epizy.com/dawexamogapinekizab.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_eaf5a86e39dd442bb14c7f00ec3db810.pdf?index=trueIn PDF document text
    • http://lapekekefexe.rf.gd/140cc_powermore_engine_reviews.pdfIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_b1d02ffb1b2b4d7989d8e91e6e976f96.pdf?index=trueIn PDF document text
    • http://lunowakaneruf.rf.gd/cuanto_es_un_metro_cubico_en_pulgadas.pdfIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_ed53da308d454485b315c2ba81d96cca.pdf?index=trueIn PDF document text
    • http://riremeg.rf.gd/download_the_weeknd_starboy_album_free.pdfIn PDF document text
    • http://xojorefalez.rf.gd/82659861770.pdfIn PDF document text
    • http://famefikapipu.epizy.com/93792891653.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_off00010218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 5512 bytes
SHA-256: cc1a8a1d1efca74f2e3d1e1b2f738c2ca26b55c363bcb7abdfbf5d5ae44c39a9
font_01_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 10864 bytes
SHA-256: d05708d27418037960fdfeba0fc05ec72b5d2a662647464a400dc16a41904b96
font_02_sfnt_off000139ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2