Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9099114002b318b…

MALICIOUS

PDF

73.5 KB Created: 2021-09-20 14:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5dbdca4a2c42013e27fa0b67b49568b9 SHA-1: db71831b1e9cb95b097e95195ddb644ee5767ad9 SHA-256: e9099114002b318b8638701df150bb71e45e926e609190a5302618120eb853de
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specific URL is flagged as a potential download lure for 'unrar pro apk free download'. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=unrar+pro+apk+free+download PDF link annotation
    • https://braindevelopmentmaps.org/userfiles/files/jufomimikalutez.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/94386093171.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/22716449940.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/fuvero.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/92358225137.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/xaduk.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65a356b6a---bugusezaduboxibinelola.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210906165547.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/73509661521.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jikorosel.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/99739498456.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/liwame.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/lezaxonuful.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/53016980607.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mizagijiwizet.pdfIn PDF document text
    • http://lobi.md/userfiles/file/reboxeduzubosilemopozor.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/633833863.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/6559806571.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/43470755881.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/bumirovegez.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309607dbdce---duzuwapibemudogarula.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/roxemixeralodesukuvopame.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_off0000bb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB78 10320 bytes
SHA-256: 0615a0ff5266ac392acf5e3b6266cfd75bc6cb364e493e16903fa10e0c00b7e0
font_01_sfnt_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 17608 bytes
SHA-256: d9671f5c53af1561bbf5e82680e338fa32899c80409ef1b4eb5c2e42b4117fd9