Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1a806b5d834da6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 08:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ee6c2414b69e4a1e517c3258bc08ab1 SHA-1: 26d667a0435e23a28ebae33f6592603bd86f4f94 SHA-256: 7d1a806b5d834da6c30798ea693b1b4721d626368444fb5f30ce9f3e720addf6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The sample's primary function appears to be redirecting users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=mobile+tv+android+app+free PDF link annotation
    • http://hzzxtl.com/UploadFile/file/20210922211230659.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/42004258231.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/4028915738.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/noxadeb.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/wulinijixepisukopidajabaz.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/52275931641.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/varanikoxemizidopabemiti.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133472ec2b6d---67551694861.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ffffa2a2c74e286304a5c7663700f56b/dabimor.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/norixon.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/12626762193.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/jevufutilowusuwewokugigiv.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/58707726447.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/wumatofonuviguti.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/giwusosowo.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/mileboputuderamu.pdfIn PDF document text
    • http://theponghop.com/upload/files/lapozuxovezegipeninomutad.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210916011322_1366846039.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/wakumew.pdfIn PDF document text
    • https://ismart99.net/upload/files/47507373263.pdfIn PDF document text
    • http://didopack.com/files/33398154970.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/48544727073.pdfIn PDF document text
    • https://linardi.ru/files/file/puxokux.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/2288706664.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_off0000b3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 17452 bytes
SHA-256: a7104b8aaf337034904ed010afa9553950e039658df57472ac1a1f468de1003d
font_02_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 10524 bytes
SHA-256: 5c6b7c9d1fcd6e7788be84d70b8cf648d8dda6056e5f8675f178a02c23339214

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