Malicious PDF — malware analysis report

Static analysis result for SHA-256 671c1ffb31310ab9…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 06:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f931ead4bc06c030af51baf9633b1d6 SHA-1: 49509904e57280029bdc7859c1d4a5a167a2152a SHA-256: 671c1ffb31310ab910d9f0d707840a78aea72759d76b2ffc58ab03c6f8eff09a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to obscure malicious destinations. The presence of embedded JavaScript and a high ML classifier score, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicate a malicious intent to deliver a phishing payload or further malware. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://terezmisszio.eu/files/file/xotatubutujagodezaba.pdf In PDF document text
    • https://ctsgroups.asia/images/file/11141260979.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/30501878218.pdfIn PDF document text
    • http://12shio5.com/contents/files/xuwajibepuv.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/kawarifewazokuwasames.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/20236918112.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/28664682218.pdfIn PDF document text
    • https://successalpha.team/upload/files/43812095052.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/88090449032.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/55202784906.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/xukejemed.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210921051137.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/kiworavevipawu.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/lidokisi.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210910200649.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/35383392006.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109130454066692.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/98224409369.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/tifasesepobaxutemaj.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/jojituduraxegibes.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/62236100213.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/36869635179.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/34988162890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=eye+fi+app+for+androidPDF 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_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 10276 bytes
SHA-256: 1e1292ab5fa49bba9ea92e6ef7252a2b2d099e9c8f91298b0166ca4c9a8ece1d
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 18056 bytes
SHA-256: 3fac6c89bf755fedce67ab4ec05fa491b6a5e3ebddfdf0cc8038c24409b6d2e3

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