Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f7ea3a66f7b870…

MALICIOUS

PDF

79.1 KB Created: 2021-04-23 21:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 38ad24fc66c79c29c73d29aa61fc8c65 SHA-1: c8082cec7b516a50e75cbc803af83b85c2612ea1 SHA-256: 90f7ea3a66f7b870c62e4c80bbc775f30a6e706f76895195fda01fbbd6204fa0
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 0.9998

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://vilenefex.ru/strik?utm_term=how+to+use+tableau+prep+conductor PDF link annotation
    • https://cdn.sqhk.co/jumivosokigo/bhaXjeh/prasident_mars_designated_survivor_season_3.pdfIn PDF document text
    • http://vereffka.xyz/performance_review_during_covid_examples1qf62.pdfIn PDF document text
    • https://wijuluberaselak.weebly.com/uploads/1/3/4/0/134016921/2094842.pdfIn PDF document text
    • http://national-verifyteam.com/suzasnsk6z.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/50_solidworks_exercises.pdfIn PDF document text
    • http://uber-global.com/how_will_education_change_in_the_next_20_yearspfg4r.pdfIn PDF document text
    • http://rankingcoach-seo.com/best_offline_spanish_english_translation_appea1if.pdfIn PDF document text
    • http://xekuluw.iblogger.org/piruzoponusas.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/icq6idT/21067073337.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/jejdije/pottery_barn_canada_christmas_bedding.pdfIn PDF document text
    • https://cdn.sqhk.co/sesedazaw/DgeWstf/ice_cream_maker_for_kenwood_cooking_chef.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/academic_writers_online_jobs.pdfIn PDF document text
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/cbd0e7ced034.pdfIn PDF document text
    • http://polnews.xyz/clover_food_lab_apple_payrpxvc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_b1d7289060884d9a8c3d5e87f9121087.pdf?index=trueIn PDF document text
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_6915ccff4d0242cc9a0d0e20cc304594.pdf?index=trueIn PDF document text
    • http://muvekalufisu.atwebpages.com/balowanerunesida.pdfIn PDF document text
    • http://setiwol.epizy.com/risk_benefit_analysis_template_aba.pdfIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_1d06ef7ce5fc4ea8a639e43e1ab0d689.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_a6cea32e1d0b47babeb9bc9fd95d2dc0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 5260 bytes
SHA-256: d9c59a666686634744e10380f7adce1dd66474e6501b94d25c8e2f9ac1a1536b
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 11356 bytes
SHA-256: f504bf118bd9f83b1730a291e2508e3082720ffb17951419bfac73e076f1e0fc

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