Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4817301602a44df…

MALICIOUS

PDF

71.3 KB Created: 2021-10-07 12:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e4e488f218463b81b9e870876ff17c8f SHA-1: 96d615537f55983cec9e9838b338c724103091f1 SHA-256: b4817301602a44df711c0ca6053171d41e0d8c4558f0d7c021f6310f5eb4359d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://asfus.net/virgsurv/userfiles/file/34468684620.pdf In PDF document text
    • https://123natura.com/stockages/files/82569433059.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/3271543165.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/vuzizanakivo.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/vepamufo.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/xesoforegoji.pdfIn PDF document text
    • https://ijp2.com/contents/files/72535151226.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/dupetekasuwisoruxawimivok.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/60917067757.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/budazelajivadigiw.pdfIn PDF document text
    • https://maviet.vn/upload/files/supasazuvekerizagege.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b76d1f7dbc911d83f08f624f8b92b27d/18916726797.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/51405454401.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/mewekokovegi.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/88695092425.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/vunogefeluwexap.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/2545572866.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/gigawajaxusuguxaje.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/98512311619.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/sovitawuzoboluwejuguxer.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/4380405586.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/90724288150.pdfIn PDF document text
    • https://irantruck.ir/data/file/parikekuxavozebe.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/94381632059.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/xifarokevi.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/bejufovomozexama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=area+of+3+inch+circlePDF 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_off0000b51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51C 10320 bytes
SHA-256: 4e8544cbc3cd80e35d0fd134114fe2fa2e183047dbfc279e98707ef97b35ef34
font_01_sfnt_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 17140 bytes
SHA-256: 7327812688e545efb6a3473b79536347d3008b5d911c113990722956c7eecb80