Malicious PDF — malware analysis report

Static analysis result for SHA-256 961406ebc6146937…

MALICIOUS

PDF

74.5 KB Created: 2021-09-21 02:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 729234d83a4c65880f5145f0f2079a15 SHA-1: 1446c3c17f86bb14dde8dc8b3224289015f5bbf3 SHA-256: 961406ebc6146937e9ea57c62ec616537043ceed57faf186d3d938bff3f70f68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=how+do+i+retrieve+deleted+contacts+on+my+phone PDF link annotation
    • https://cytairtool.com/test/userfiles/file/20210910_8d377.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210918_A33CD61EA2FDEA2A.pdfIn PDF document text
    • http://stisk.com/file/mebes.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/99579748270.pdfIn PDF document text
    • https://znalac.com/userfiles/file/vexasetif.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ak4magelqlr8hcglgogr30cq4/vapujilubusitusibapepe.pdfIn PDF document text
    • https://value.ae/userfiles/file/makavitatugapone.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/38700500994.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/jutunan.pdfIn PDF document text
    • http://labsshop.com/d/files/84831260832.pdfIn PDF document text
    • http://learningkey.org/userfiles/xuvewilemopenu.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/kuvumuwexatagekipo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161311d5f3166b---wakekanurovafav.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/nokimufuwolosogafapelap.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/30269477050.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/kegorufinukagowezefele.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/zalok.pdfIn PDF document text
    • http://belloverde.net/emailer/file/86533293981.pdfIn PDF document text
    • http://ledins.lv/cms/file/77709275080.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/28489513363.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/wojodiwupixowisap.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/dozamu.pdfIn PDF document text
    • https://desco.scp.hr/files/wileledonurexizuxu.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/nogaritexi.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_off0000bf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0A 11036 bytes
SHA-256: f6965358d7f831c4731ea08755e1c1246619ffd0bb21b592b493a4f58df700bb
font_01_sfnt_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 16872 bytes
SHA-256: 4c291e2aab547e033feeae9ac9b9a4a45c4d9430333c65a478f2e40d22949d50
font_02_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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