Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfaa4ea4f9858ed2…

MALICIOUS

PDF

74.7 KB Created: 2021-04-09 00:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 968792d1f8b558b391e097d94ac170fc SHA-1: c4795f6a04c96e3b45c315de1244691cc480257b SHA-256: dfaa4ea4f9858ed275867435e96cb592b50f857da893b128e98b0cae6a6725a9
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 ClamAV and 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 0.9997

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
  • 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://pelibifir.ru/strik?utm_term=how+to+load+echo+srm-225 PDF link annotation
    • https://dizegixevovule.weebly.com/uploads/1/3/4/5/134576191/vavawogo-zabuzagipar-sepojuj.pdfIn PDF document text
    • https://cdn.sqhk.co/dodagirojep/Bjhguij/vibuxixorovuwipixufewexo.pdfIn PDF document text
    • http://bekokax.getenjoyment.net/nakezed.pdfIn PDF document text
    • https://sixokibikije.weebly.com/uploads/1/3/1/4/131437702/zudedovalurezo_lomok_dapum.pdfIn PDF document text
    • http://lasiwefomibew.sportsontheweb.net/calendar_2020_october.pdfIn PDF document text
    • https://wadaxoleda.weebly.com/uploads/1/3/5/3/135311928/molewuxilatik_tofapukomu_fogawefike_gariwoj.pdfIn PDF document text
    • https://jetasiduneka.weebly.com/uploads/1/3/4/5/134586997/9105c1a76.pdfIn PDF document text
    • http://givimemaregudum.sportsontheweb.net/the_sociology_book_big_ideas_simply_explained_vk.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/chcXkIS/republique_democratique_definition_juridique.pdfIn PDF document text
    • https://papafamibupa.weebly.com/uploads/1/3/0/7/130775965/vesisinetusom-damom.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/78908982467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f59f28ea-bd3e-4b63-90df-07268fb40f10/3480024533.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/442685799.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/meyer_e47_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72cef72-e0fb-4e0b-ab8c-75f0d51b8b28/sidaguzesarelusuxagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423510da-db9a-4caa-830a-fb92a137f970/gazonurukiwezelagix.pdfIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/78644888133.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/paradise_lost_full_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/bodim.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/zigupakaw.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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 5520 bytes
SHA-256: 648ff1c9ea07b79f6b829ddde4ebb9955a948d775d1e2d0d854a6d56286fa418
font_01_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 10872 bytes
SHA-256: 0f63a8d705324389cb71868c81365bb26df92dd285a730fe7cf1313b3291e87c

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