Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b19459252fec3b6…

MALICIOUS

PDF

76.5 KB Created: 2021-09-12 22:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42a42b525b42ffe3cfb253ce613d7fc0 SHA-1: 4f32ff222014faaf92f5007d53a50c1acfee0e63 SHA-256: 7b19459252fec3b61c12f54ca98118e3f92dfcbc95cce813e14bc920f5875de8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://synerhu.ru/uplcv?utm_term=bodily+kinesthetic+intelligence+meaning PDF link annotation
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/26987440859.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/mobovarudiv.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/10275966450.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/fudedogibe.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/78681668350.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090223133348.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/sokevafenakigab.pdfIn PDF document text
    • https://cncunse.com/d/files/xolabizi.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///32142402925.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/bidurobusema.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/pakovedukimero.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/wodanok.pdfIn PDF document text
    • https://revive.fashion/upload/files/jotagitesemep.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/rimuliperirawe.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/29526418145.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/wanefuxoraderujajiraz.pdfIn PDF document text
    • https://masukpt2.com/contents/files/madogefala.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/tunugibiku.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/kon24a84o6rrnlftltnggadp9g/jagozifur.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/wakefubosazuwabon.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/64333735829.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/bimeputupafimixagilagixo.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/sunujemaxujevologes.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_off0000c8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FC 10976 bytes
SHA-256: fd4d3a06cc47202296428b876a3456287aa464268fce5b26286fc6badff98e82
font_01_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 16256 bytes
SHA-256: 6a1ada0ba79b52c142facf98897e2b98e94eac1bb6724d99a57f7555d72c2c0b
font_02_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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