Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3fa4daad893f13…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 07:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7dfe9bb77547bd5c786b166243f2b7c8 SHA-1: 80499eb055b70a87d572ffdfb20145660036718b SHA-256: 3e3fa4daad893f13a9225d4c4be69e3ae81223adbd2df8ec7196fa925b6d50b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's primary purpose is to lure victims to potentially malicious sites. No scripts were extracted, but the extensive use of URLs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=apn+in+network PDF link annotation
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/72089714593.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/rejawalif.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/suwovezawofanunitikobolo.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/jexolusufutozo.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/95557244259.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/3840566609.pdfIn PDF document text
    • http://surestegc.org/documentos/file/24697739833.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/sofawamonoxoma.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/527295f313d25c702c395ad3b04d073a/lekefopidubusav.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/pudavodusimoroxol.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/zegunepe.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/63319783506.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210901072027504.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/rolixozoposum.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/ribogumebidodituf.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/bozeburukituvetalipej.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/gidomigesa.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5ddc324bfa7e43742949fc0167a73060/loxuxasitixeji.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/29391246618.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/paxejegokaxipowinadokos.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/28646623275.pdfIn PDF document text
    • http://gapp.fr/medias/files/nasoruzumamaxevokuzegofu.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_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 19120 bytes
SHA-256: ced30d3dabea1da04dfbed266490a36f69e59c6c8e491e96fa552eca70771212
font_01_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 10028 bytes
SHA-256: 9bfb6fd72d93023c5f18b08408a9e97ec49012fa02f022b16fc3c201aafa189e

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