Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae0cf557641be33…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 07:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00a701f798c48912d1f9d44e8c2252a9 SHA-1: e4a84fce2d09a3c6042f3e457e79e1b5950cb4f4 SHA-256: aae0cf557641be339ba65da0c7b5b3d64931774f4c3826c5603eeda60c891121
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external URIs, many of which point to disposable domains and are likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=como+crear+cuenta+google+para+android PDF link annotation
    • http://henzefashion.com/userfiles/file/25278445533.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/xixawubujupegumasip.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/75338652277.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/53185760217.pdfIn PDF document text
    • http://entrackintl.com/uploads/11523846134.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210917221017.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/2357664284.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/76517608075.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/sidulo.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092109360897.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/33447249945.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/93953554469.pdfIn PDF document text
    • https://desco.scp.hr/files/zorekupowab.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/21627085555.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/86824186987.pdfIn PDF document text
    • http://cycling-software.com/files/file/fusatibe.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/h50dlurvs0jtv62iivjer06mmc/jexetukulizuwopu.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/25846261515.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/40764596095.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/69226831805.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/65549801022.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/mafewewewetowew.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/gabidufobaxoderateluzafa.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/kuburoxo.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_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 18900 bytes
SHA-256: f5ffd5593e82083435d9c875fb8884e9643e50a054b31c9055e1d3c481de17ed
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 10820 bytes
SHA-256: 4772fc86e2e5e5b0cdadd35b4eb0be886601c4ffcb71d082b7368f20872413b8
font_02_sfnt_off00011e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.