Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d3a7f190284614…

MALICIOUS

PDF

76.4 KB Created: 2021-10-09 20:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 8a31f19aa364d6a076d84212878d39ba SHA-1: cf695e5d20c7ad6ab33c3a9850172bcb0bfa2406 SHA-256: 82d3a7f190284614bbd577be539ba6c2a2aac2f95e825776ef566fd492f5fa0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to potentially malicious or disposable domains, suggesting an attempt to redirect users to harmful content. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://toskov-yordanov.com/userfiles/file/vogubufikudari.pdf In PDF document text
    • http://goldenagegroup.vip/userfiles/file/folawatorurunovusese.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/42478662537.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/77680644903.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/8231056201.pdfIn PDF document text
    • https://topupdana.com/contents/files/noxagimozumapej.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/vumatekawabexo.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/vopirup.pdfIn PDF document text
    • https://wecareprogram.org/images/file/lelame.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/7246263391.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/43289438044.pdfIn PDF document text
    • https://hkki.org/userfiles/files/sajijosimoduzagikiloma.pdfIn PDF document text
    • https://harom.ro/files/file/90766571554.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/sutisapim.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9df0aa540d8cc80ed5e9beb35e31382f/moben.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/88438414946.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/zabedurezipesiju.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/44086983641.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/82308126723.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/84308947774.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1632450610.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613023269e028---5654280013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=whoever+vs+who+everPDF 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_off0000c685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC685 18752 bytes
SHA-256: 71ec409d50d347df1b33520363c944a0fb0cd698a66c834f6cf3f360866a834f
font_01_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 9848 bytes
SHA-256: 026439be1146e79c159a80d1792e40193de7d33b4c5a7a23f7520506c4f76d4e