Malicious PDF — malware analysis report

Static analysis result for SHA-256 745c5fce88adde83…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 00:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 15a88b537af2664d312308e51db9f4a7 SHA-1: 46c2921e77f5c473ddb6e9e83ef6016bc944ad29 SHA-256: 745c5fce88adde839196cf08b8b7926e4e5b2643e7b7caa880012bfd5e3358fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gagiongvitgiong.com/ckfinder/userfiles/files/63358492819.pdf In PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210908_E161AA16DA986A09.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/83204507836.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/samonuxodiw.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/64508457502.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/wokituvoxet.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/70104780816.pdfIn PDF document text
    • http://rc-modeller.se/images/file///8996462630.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/lexofanode.pdfIn PDF document text
    • https://krusomying.com/data/file/61518781291.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/melexi.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/41239329689.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/31467204018.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ag63oi2l303df397j78pihsol7/90794507060.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/05/bebimu.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/92476568140.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/dutabikafuxotapop.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/gupojezimod.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/vudowifavu.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/90851567734.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/zorojile.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/17410466857.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/udfo608n67dt1qavjkrkqs5t26/95932521995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=vampyre+slayer+rs3PDF 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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 10256 bytes
SHA-256: 47e92fe7488eef7b66bfcc9a3ef43fa0e44d0c36875c71c4143f8c7b74f06354
font_02_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 17616 bytes
SHA-256: 798919c8a7196056c579b865718ef12f19cbbde0f73e65e4fdc7b69e8f216437