Malicious PDF — malware analysis report

Static analysis result for SHA-256 9adcc2a6074daabf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 07:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b250d137983302e8c79ef34cfed750d1 SHA-1: 54d3867c2f0b18b62dad0d25987b7d8d4d2f056a SHA-256: 9adcc2a6074daabf32727fbea4d55b7ca442ca1cd8780cd841e12f780ace1e67
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to 'inwebjor.ru/uplcv', suggests a phishing or malware distribution scheme. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the attack pattern of luring users to download content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=download+gangster+los+santos+apk PDF link annotation
    • http://fusiongrup.ro/userfiles/file/dulowabubezimudakorive.pdfIn PDF document text
    • http://vititanon.com/user_img/files/xixodomezawobu.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/70625549486.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/31765283409.pdfIn PDF document text
    • http://ud2-140.com/files/gizikilunizakimuvozu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7cb04a83---52238764518.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/68169812323.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/puxitetosibude.pdfIn PDF document text
    • https://magerp.org/upload/files/vobawanodenoladurer.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/pifaxefibuxut.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/xudevikufunifugavujoxituf.pdfIn PDF document text
    • http://nhuahoanglong.com/luutru/files/28041566776.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/jukavubuxotefedax.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/mirapojofeda.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f883659716---memirexilosado.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/65738872752.pdfIn PDF document text
    • http://atrsara.ir/resource/files/pivetebowu.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/44138601167.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/60878007219.pdfIn PDF document text
    • http://santeh.md/img/files/49201656956.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/juvazimubeteme.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/nekivadamekak.pdfIn PDF document text
    • http://beta-rc.com/upload/files/3193113665.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/71312771688.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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 10656 bytes
SHA-256: 584519c1547ea2f124ec8cd03eb061f035e224417b3a763796965938e63c4af7
font_01_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 18760 bytes
SHA-256: 4b8b326d655fe355ddce07b9e32bed9864c5b145179a3d5addcff1408bc455ba
font_02_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1