Malicious PDF — malware analysis report

Static analysis result for SHA-256 406a9e31ddaa4c32…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 07:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c5b0fcdcdd54d4442da837c55968682 SHA-1: f9f54f09b867d8f710ff5bbdee98e960b8ac09f3 SHA-256: 406a9e31ddaa4c3200f9b345f1fe1df953f033979e511f56677cfed391b0a21f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the nature of PDF malware often involves JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=how+long+can+you+keep+rotisserie+chicken+out PDF link annotation
    • https://bikeid.net/ckfinder/userfiles/files/degamor.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/eddc34.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632042260_5b1acf8400.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210919180809.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/zozitipudatawoduwexedogew.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2fe6e99beb91377d51a4dcdd02a3bace/tejujidudifebokomij.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/mategig.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/talapotevaxenowawepapa.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/luseluxemaromenufidowatul.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/75245216746.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/safisobefukuk.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/gajonenivevabolu.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/83246100728.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c76864abcc5369f043f423a9697886b4/tegewan.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/50316729094.pdfIn PDF document text
    • http://prosquash.by/data/bapibifetufirowo.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/79524215393.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/80890573776.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210902_FD2E28B165D780AF.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/sarus.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/bebami.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/dogasegeb.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/4594513899.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/80141056993.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 11036 bytes
SHA-256: abec071bef04fa70c01b3b1dfb79f8799c909c3d158e9aa51b33a522de6132a6
font_01_sfnt_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 17880 bytes
SHA-256: e691646971ac4db2390c3c49ce5aa553dc5adcefe2527d303697d7fdae26ff19

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