Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb49755f15da21e…

MALICIOUS

PDF

80.1 KB Created: 2021-03-14 03:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 70a8f0548ff70dee2b1319f77edefd0e SHA-1: 4c98c20b9b4ac34532ecefa85679700c79aba3c0 SHA-256: ffb49755f15da21e863dfe445b35f85b7d06ae01dce289eaa5f0785b2d945ab7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://kuzutuzo.ru/award?keyword=medicinal+plants+project+pdf PDF link annotation
    • http://medazuxa.mywebcommunity.org/dudunowebubevo.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/whirlpool_accubake_gas_range_oven_not_working.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/aircraft_maintenance_engineer_course_in_india.pdfIn PDF document text
    • http://kinorio5.xyz/love_yourself_heal_your_life_louise_haydtwoh.pdfIn PDF document text
    • http://canonsburglake.org/what_do_different_color_rubber_bracelets_meanuhcyj.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/software_development_engineer_intern_amazon_interview.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/vizio_e420i-a0_screen_replacement.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://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_1a0158bceca0470b85619ee9fe5b5017.pdf?index=trueIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_8eb99ab828ad4b8096fab21e4dbcdf82.pdf?index=trueIn PDF document text
    • http://seroritubofa.atwebpages.com/bodavuvezejogazujilojuxo.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_f51084a699d246b3b2ad7ef07c5685a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemupajese/tizobuzupomu.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_6a8d08901d3d49eebeeb24be34ce04c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/how_do_i_reset_my_furnace_thermostat.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_b78492988af442bdbba59fc102b7909d.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_5503796b3108428e840b98b66ecb4b3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/ielts_academic_writing_answer_sheet_task_1.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_523b65d7288b42c18eb3307ff1aba290.pdf?index=trueIn 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_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5016 bytes
SHA-256: 3cf727b78d49826a533750908539798d0710c3f7e9699364b61957e5b5590acc
font_01_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 10888 bytes
SHA-256: acfd12ab23cc492d800af53b4903949a400ef67106f498905fec49c812115f0b
font_02_sfnt_off000123bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2