Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc25e3c4a87cf9df…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 11:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4eb3c1ca1580c024736445b0c3410502 SHA-1: 3ddf67ee2c23be2938c58a4aac7a8229b9dfe2be SHA-256: bc25e3c4a87cf9df2264d0d453cae4e27845ec03f6a07089cb825ad9f089f4d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is part of a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=essential+grammar+in+use+3rd+edition+pdf PDF link annotation
    • http://britishcytology.org.uk/ckfinder/userfiles/files/64875014325.pdfIn PDF document text
    • https://asiapharma.la/files/files/43530602998.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/62003215184.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/toviwofubo.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/revezinukazesixalugazeme.pdfIn PDF document text
    • https://termofriz.rs/files/wuzifowovujeru.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210913095709_327616508.pdfIn PDF document text
    • http://symbolfoods.com/files/file///55758409896.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136e483764ee---sukorujibipepe.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/83861515214.pdfIn PDF document text
    • https://km2804.com/ckupload/files/dugixivijubub.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/kelogudipedetufutapu.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/nepodomuxifefu.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/falutudami.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/noxabomaxapifodawosudo.pdfPDF link annotation
    • http://zenithmetals.com/files/42114361679.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/41071750531.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/71881568205.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-13/20210913121047331119.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/vegagogade.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/kogijovapino.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/lasiwobinoroxukab.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/togoperuve.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/15311260824.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613f543d816c0.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_off0000c564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 11096 bytes
SHA-256: 5824f6bddd31773bbb83be23fb893f59a99b2c3ea8ba58663bd650794192caae
font_01_sfnt_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 17976 bytes
SHA-256: bf924d78c71e6f3328e8b522956319c403d8401ac40865cf76cf3a477069945b
font_02_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1