Malicious PDF — malware analysis report

Static analysis result for SHA-256 e465f83899a66e45…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 19:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48ecb7e2f8ecb0f2a14ff8f79e2550b8 SHA-1: f0012061d8307bd0fecb50e93cb80f984809a662 SHA-256: e465f83899a66e45e5bf10a82c9ff1def11d3f68b1feaa1cdd103e80edcdbad2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pokebarslo.com/uploads/files/67770462325.pdf In PDF document text
    • http://dongduong.net/Images_upload/files/97558574401.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-13/20210913144753127597.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/50267213382.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/32432903045.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/79655594567.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/midedibaxopoxixelakazu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139544fc9541---29201732123.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/58312256514.pdfIn PDF document text
    • http://xprchemical.com/upload/files/78055724776.pdfIn PDF document text
    • https://inks.bg/userfiles/file/tebagebivuxez.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/zatoroxafine.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210909_2A333C2929917528.pdfIn PDF document text
    • https://premiersuli.hu/files/files/wevoditabovimiro.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/damosepanudemosirudewoka.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/zinakulatuzagakipalufid.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/74883633282.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/jubunepisilesapuselozipu.pdfIn PDF document text
    • https://viceda.com/userfiles/file/jolunubar.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/24393397886.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/62508244066.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/85718314.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/binananokifofatusulub.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/woxeluzekuvere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=root+my+device+online+freePDF 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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 17848 bytes
SHA-256: 66f3df985388b937522a85e2974dc544df97cb34f3e93b7962321cf449f61a30
font_01_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 10532 bytes
SHA-256: 251598ec440b07faab0a673452500c740c31c1a0867950373b6fe7d8d7bdc0e1

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