Malicious PDF — malware analysis report

Static analysis result for SHA-256 d840ac206b5fd61c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 10:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adca849c34aa7a79d39857e055c4f62a SHA-1: f8fc20245ea5f47f985b57a7ce9556507b8239b5 SHA-256: d840ac206b5fd61c6519663fcce87ad8a83dc7ded5ade6daa54963fad27ec4d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or phish for credentials. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://thuexe7cho.vn/upload/files/moxekufusi.pdf In PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/garufumato.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/ziliv.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/29214514588.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4133d062---73339479073.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/rubugowarulo.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/sevabutagaw.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/jabofojedugoxarole.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/7995679304.pdfIn PDF document text
    • http://photofetimages.com/sodoridokil.pdfIn PDF document text
    • https://hobbypet.cz/files/file/gejoravewetu.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/kafiju.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/48275133469.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/zivopamuguvodozetegat.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/kinuwenuxiwevuxu.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/17335969299.pdfIn PDF document text
    • http://full814.com/upload/files/13812424158.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142a43eea0ec---vuloxikerow.pdfIn PDF document text
    • https://fong-cai.com/upload/files/bebajix.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210914185611924.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/sezivimi.pdfIn PDF document text
    • https://medtek.vn/storage/file/vopedepefuliduviso.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/bamanapedikudepux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mi+a2+new+updatePDF 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_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 18504 bytes
SHA-256: d20ee7bc5ec8c725f7c1befb8528f609593f784123808d5c04250a13c806a27b
font_01_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 10248 bytes
SHA-256: 6c4e34ce3193d168978fd2db79eb375511451b3b26da153128a1521458274d86
font_02_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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