Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09a7af475817e82…

MALICIOUS

PDF

75.9 KB Created: 2021-03-05 11:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ff5ace5ef4a4e27e4746dd913fe83b6c SHA-1: 1e78f5bcfa75b25c3815ab5b6ee4faa7b3b46362 SHA-256: a09a7af475817e8230aa2ce472843cfff6a4839ee02f99c92ba72a0b4e87b6c8
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 pointing to disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains a reference to 'Arduino projects for beginners in Tamil', which is likely a lure to attract victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to redirecting users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/123?utm_term=arduino+projects+for+beginners+in+tamil PDF link annotation
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/kijitamexegi-zufisudasasexeg-gojiroximonob.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/ipc_acceptability_of_electronic_assemblies.pdfIn PDF document text
    • http://zelolugo.22web.org/wilevoxegodekan.pdfIn PDF document text
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/6281764.pdfIn PDF document text
    • http://uscreditmonitoring.info/weather_clothes_matching_worksheets8gn2w.pdfIn PDF document text
    • http://copyrightmediahelp.com/canadian_export_commercial_invoice_templatekgnxq.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/zefejesewerigego.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/dazifozixawus/blowfish_algorithm_explanation.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_cac99d707e8d46939ed45e02f29167de.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_4d2d6044685e420e9fb56b0d9c492b19.pdf?index=trueIn PDF document text
    • http://ropanosuge.rf.gd/misery_stephen_king_movie_netflix.pdfIn PDF document text
    • http://linexiziretewoj.rf.gd/superior_court_of_california_county_of_los_angeles_citation_lookup.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_b0a735a00fcd4910a9bd30badd36ba8b.pdf?index=trueIn PDF document text
    • http://golujaxi.epizy.com/sustainability_reporting_guidelines_g4.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_8b80813c98d84674913745861d9af8a7.pdf?index=trueIn PDF document text
    • http://fabodatutowew.epizy.com/wisconsin_individualized_service_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/sibop.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/9231121590.pdfIn PDF document text
    • http://nogojituwizax.epizy.com/honda_pilot_service_codes_b12.pdfIn PDF document text
    • http://luvewon.epizy.com/63104097716.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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 5680 bytes
SHA-256: 30244de12ebc8241437e036767e82a068ff10e2c6585e32e81f6d296badce09d
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 10580 bytes
SHA-256: 341b56dab940d55f9245eb2b42bd1fa3d246b69513c5099306c6abb841a49b5a