Malicious PDF — malware analysis report

Static analysis result for SHA-256 e936eddcff304427…

MALICIOUS

PDF

70.6 KB Created: 2021-09-09 20:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 8cbdc4f11ce9c7deb1d28f1eac1668b8 SHA-1: 6d99f3a54f556be14c794419cd3a06be20190d24 SHA-256: e936eddcff304427738e27e612aae711ca542aabb4f94880b528a5f081a54e18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://xn--80aaijzh9b.xn--90ae/documents/file/nufavotezokizikexo.pdf In PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/43783746863.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/wexexipikaxexusomato.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/mavefovonilomit.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/joluritovisujenulotomili.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/58932155614.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/30304792554.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/nalarexuz.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/murasupawatanikakopi.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/80301884216.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/lijikosu.pdfIn PDF document text
    • https://luminex.pl/upload/file/retenowazorokotitu.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/86024768136.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/656260f035d32cf03f58aac89c87645c/lamakupewumuw.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161325f52bb145---49542899394.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/genolebixuzi.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/77415907966.pdfIn PDF document text
    • http://schokofontaene.de/idata/disofisaxuwosujevumufi.pdfIn PDF document text
    • http://3asoft.vn/img/files/82780146209.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/29066570683.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/zokakitugowetuwajusoxofof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mobdro+stopped+working+on+firestickPDF link annotation
    • 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_off0000b2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CD 16052 bytes
SHA-256: bc5ab526849b2acb1840f8c516825f12ad047e008a3e77e12d19824c99c36acd
font_01_sfnt_off0000db71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 10900 bytes
SHA-256: f8154c25345042a2695f992309cbb9c249a3bbcd2595068e888b7f7953a47d95

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