Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe1092dd7db84ef…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 09:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e815af2f4ce61f43fb02c153e9f1d570 SHA-1: b9ebb4f5c84fa42170f943d8ef8b7c548e38735c SHA-256: dbe1092dd7db84ef7a39a0fcd775904658c0ee54a5f13c7af9c0491f6a88ea57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many disguised as file downloads and one specifically mentioning 'android system update', strongly suggests a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and external links point towards an attempt to redirect users to malicious sites.

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://chcial.ru/uplcv?utm_term=android+system+update+28 PDF link annotation
    • http://imdad-egypt.com/userfiles/file/90708859370.pdfIn PDF document text
    • http://levotst.com/uploads/files/10178891170.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/26752544399.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/duxumalevaxisowa.pdfIn PDF document text
    • http://airsoft1.ro/files/file/ponogibobomosifurawowa.pdfIn PDF document text
    • https://brakos.it/file/bifemekuwi.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/21017793495.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/xipatotozubakuxug.pdfIn PDF document text
    • https://asiapharma.la/files/files/8170175986.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/kenafotekidugevoruvek.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/vifixolilokinet.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/63447752268.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/51398517031.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/19268514892.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/291409_62885809956.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/misifupobudekomuve.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/98285060106.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/80935316819.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/15464162522.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/jafalaxebipawavotimiwuxa.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/sefivaj.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b426eb35---ripulunejamefatuvamet.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/pusenavapokiduzinemapigo.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/nilizasexaduvitabagojiba.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/kanokanuminabuwifos.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_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 19000 bytes
SHA-256: ec942ac84ec88858d7330024eced69cab21747650c61b74caee5f5627f308061
font_01_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 11032 bytes
SHA-256: 4ba07a37a69d2d7fcc380e2f96b7464e98e1733c0ed98361598741b888a17792

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