Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c13db7937c32e5d…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 17:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14c08446f1cfc582586f82d42d4a6f3b SHA-1: f71783caa51ddb1e63e5919fcc8bd6ad9da4cd59 SHA-256: 3c13db7937c32e5d214cf0d4d6da3e29c19d3d7befd629cb1c79036b9e5b876d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on disposable domains, suggesting a link farm designed to obscure the true malicious destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to download a password-protected archive, a common tactic to bypass security gateways. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=how+to+install+flutter+on+android+studio PDF link annotation
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28451974480.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/riluluwaxupadimodadomej.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/20750765634.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/bejatud.pdfIn PDF document text
    • http://podarox.ru/public/files/7165556219.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/ruzetafetokilixilozimu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613036c542b0a---27460505629.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/losofigokixepaj.pdfIn PDF document text
    • https://bagstyle.uz/images/file/kupozosiwinin.pdfIn PDF document text
    • http://methese.com/upload/files/79095974333.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/nurolafejipawekamov.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/35845863197.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/gakosulam.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bupajefebanujawo.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/31050663875.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/bovopoxelaluzu.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/36324144650.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/7310269995.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/43047730359.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/poxugirerevofowuniken.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/gedevajufebaxudo.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/21928626441.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/64986715182.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_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 20132 bytes
SHA-256: 078af25f04266817cd88579c5f8b26c75c640a169e8e5daebc5dcc8cbb8ea36a
font_02_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 10524 bytes
SHA-256: a4d375f9effe1e6bb9ca6f1fa0eb3ad232de0d05e53a7a8767a9a9a0d344315d

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