Malicious PDF — malware analysis report

Static analysis result for SHA-256 f306d44ec1e0e7a8…

MALICIOUS

PDF

77.6 KB Created: 2021-03-05 09:10:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 461508ad10b0c13bea4721438c94ba9b SHA-1: b33cb7ac9c7930e38ed105d4d4311e7203ff7543 SHA-256: f306d44ec1e0e7a87ebba3e3ce1cf86c6bbd7710dbe0bead4a28002d42599f4c
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 0.9989

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://bologen.ru/123?utm_term=omnisphere+2+presets+bank PDF link annotation
    • https://cdn.sqhk.co/zipirevofu/Zihig5Q/best_vpn_for_pubg_mobile_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_6036b2457d2b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_602177f6db946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496013/normal_600c061c2900b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_603f3ee31d97b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5fe33dc1e86e7.pdfIn PDF document text
    • https://cdn.sqhk.co/sarokuneti/igidRXA/sling_tv_channels_list.pdfIn PDF document text
    • http://fazuwusi.22web.org/predictive_analytics_jobs_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/xPJijgj/belofutukurasawef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5fcedb4a313b7.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/igOBhdV/nubajokusuxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupenokisu.epizy.com/free_norton_antivirus_software.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/gukilowuxadasefu.pdfIn PDF document text
    • http://sudebesiku.epizy.com/xerotezexijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c060b414-bcc6-450d-96a5-c3a23ce721e3/dyson_dc58_take_apart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd93910e-4102-4ad5-a1a9-fee1ac51b048/youtube_how_to_winterize_your_travel_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61c5d99-9af9-48bd-bded-826d27212bbf/rezakidomesox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d405450-9d2c-43c6-8f93-ba5b9bcf009d/54149822588.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/chinnari_pellikuthuru_all_episodes.pdfIn PDF document text
    • http://tuvakaj.epizy.com/xasazivetidozilozipe.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/microsoft_sql_server_express_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e44cbc1-ff66-444e-92e5-49cb700f58e8/are_ativa_shredder_bags_recyclable.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/new_york_prentice_hall_chemistry_textbook_answers.pdfIn PDF document text
    • http://mafakizukizunof.epizy.com/bokebelabegedowivulune.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_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 5388 bytes
SHA-256: 8fcf4421d8a91ac9b2d4c6daaefd2923e3dcfbbaa30683d262a65b502e019fed
font_01_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 2140 bytes
SHA-256: a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
font_02_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 12020 bytes
SHA-256: 317548c0748df156a771f7bf1205d3d883e6d8298034eb2cd344993920856b36

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