Malicious PDF — malware analysis report

Static analysis result for SHA-256 2797d988ae5dff75…

MALICIOUS

PDF

78.1 KB Created: 2021-03-12 05:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d304e62cf71a1327f45852ff84b43cb2 SHA-1: 7256933b3e33775c130fef827face01dc7f73418 SHA-256: 2797d988ae5dff75b3f82dd424f27733b7feeb71fbe4397f4fa2e4a9b724ec0a
126 Risk Score

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 0.9993

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://dafemum.ru/strik?utm_term=the+witcher+3+switch+guide+book PDF link annotation
    • http://damita.fun/sipolobiwigojozuddinc.pdfIn PDF document text
    • http://zumbayuliya.online/the_entertainer_sheet_music_beginnerwjzap.pdfIn PDF document text
    • http://dragonflysagewellness.com/kanban_successful_evolutionary_changco6xo.pdfIn PDF document text
    • https://torejijifixoni.weebly.com/uploads/1/3/5/3/135335296/kaxavolofezib_pumefodesexo.pdfIn PDF document text
    • http://prizinsta365.online/dyson_slim_ball_multi_floor_vacuum_reviewsucdnj.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/how_to_use_oracal_651_permanent_vinyl.pdfIn PDF document text
    • http://bbflowers.net/65572498746odhfu.pdfIn PDF document text
    • http://rastet-malysh.ru/38180616835sm3rx.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/NrnhjX8/8336735274.pdfIn PDF document text
    • https://vuvogotekepuma.weebly.com/uploads/1/3/0/7/130776629/fetezawigoku-sojufipev-jurazunomo-zijidox.pdfIn PDF document text
    • http://parralax.net/line_6_spider_3_30_watt_manualzfil2.pdfIn PDF document text
    • http://totalcreditcheck.info/john_deere_tractor_for_sale_-_craigslistp1vps.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/95743442601.pdfIn PDF document text
    • https://diwesosun.weebly.com/uploads/1/3/2/6/132695938/f5b585c42.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/jiDjbqc/conscious_sedation_guidelines_for_nurses.pdfIn PDF document text
    • https://kesesitevon.weebly.com/uploads/1/3/5/3/135317357/dobifadigivazopodipu.pdfIn PDF document text
    • http://urolog.xyz/advanced_business_english_vocabularysafuf.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/bozem_baruwitefizi.pdfIn PDF document text
    • http://zdorovienashevse.xyz/how_to_write_a_macro_in_excel_office_3651tvyc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zodejewab.epizy.com/negopuwelatuturo.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/jidufuvagatoporobuligo.pdfIn PDF document text
    • http://zefitog.epizy.com/most_difficult_maze_in_the_world.pdfIn PDF document text
    • http://pegalisijeg.epizy.com/alimentos_transgenicos_en_el_peru_2017.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_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 5368 bytes
SHA-256: 0120f0aaa10cb66b8d4b51f108f079658d30a0dc1ed2d87a6804ab7a27a236f8
font_01_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 10300 bytes
SHA-256: bcb5e7acf8a3fcf7d17671285a03dc66bc62286ae0938cc314ed19f22d216330

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