Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd455466c71836e…

MALICIOUS

PDF

79.2 KB Created: 2021-05-16 00:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 00ff3695e00985c04bc099522d56d269 SHA-1: 54d68b6c0a792583e394e938b50c8c7604199c72 SHA-256: dbd455466c71836ee14f3b74c7ce2ab36e3c5acbe75f9abb85070aae4aba761e
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=formula+del+volumen+de+un+prisma+de+base+rectangular PDF link annotation
    • http://ergors.space/gastroscopy_report_samplezz9w2.pdfIn PDF document text
    • https://tugokuwotim.weebly.com/uploads/1/3/1/3/131379049/totugu.pdfIn PDF document text
    • http://mydenverneighborhoods.com/el_alquimista_libro_reseaybwmf.pdfIn PDF document text
    • https://koxabiniz.weebly.com/uploads/1/3/5/9/135994092/nojixopivozo_mobopapuxive.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/40444226245fscho.pdfIn PDF document text
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/3656479.pdfIn PDF document text
    • https://zematewisa.weebly.com/uploads/1/3/4/8/134897668/4226246.pdfIn PDF document text
    • http://goodshopsales.xyz/54804656418wifg6.pdfIn PDF document text
    • http://ebay-coupon.ru/arena_football_league_2020dm0cq.pdfIn PDF document text
    • https://bumilumijoxaxuv.weebly.com/uploads/1/3/4/4/134497753/solowudaboforufabek.pdfIn PDF document text
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/tepovuzerumipib.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/mexowisepafizefakisubpuj2y.pdfIn PDF document text
    • http://casser.xyz/agenda_mercantil_2018_descargarq241z.pdfIn PDF document text
    • https://betataniboluwi.weebly.com/uploads/1/3/0/9/130969090/45f0e8180829d.pdfIn PDF document text
    • http://fumigatoff.online/how_to_do_row_gyml66zr.pdfIn PDF document text
    • http://losqutoq.online/nopaferokaxadawula0og.pdfIn PDF document text
    • http://hermidkovo.info/how_to_fix_charging_port_on_xbox_one_controllernusdi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/bus_route_map_app.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_4489924d8e154b19a9405e72418dfe40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/household_budget_template_excel_uk.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_fe885d958b134476b5bd0f87ca088271.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/forupokisip/69483768764.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_e93af0d16dca47048f8f18bf44dc6386.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/reporter_tv_cabralia_afastada.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_0c263cc3e7e6483a925e01e41ca4cdbc.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_48d0299388094286b88074b5e13c182d.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_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 5548 bytes
SHA-256: 8817ce88ecf899ec77788caf74ed05f524a441bf49fe85fb7520a3a17fe4a754
font_01_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 12164 bytes
SHA-256: f78df22c018f561f399788dd25c8b21de6689d92bd902ebb4992dbecc1c48b62

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