Malicious PDF — malware analysis report

Static analysis result for SHA-256 30bb35256639165b…

MALICIOUS

PDF

73.3 KB Created: 2021-02-17 18:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 03f7641aa761bf4f0dfc283398039bbb SHA-1: b0d47ffce05cff315b721c72a6ae599f22cfed08 SHA-256: 30bb35256639165b4d6a79f64cf55a786a6b6cb46268bff0208be46a783d71b0
136 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a redirector link disguised as an image lure, pointing to a phishing site. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL is used to redirect the user to a phishing page, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/wix?keyword=jacopo+da+pontormo+descent+from+the+cross PDF link annotation
    • https://siroxexorap.weebly.com/uploads/1/3/0/7/130739693/fojof.pdfIn PDF document text
    • https://dogopakuva.weebly.com/uploads/1/3/4/6/134698139/sabij_zupubuxirefumo_tesewidopomo_zibubejiwapip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480899/normal_601b431891711.pdfIn PDF document text
    • http://bazis-rostov.com/56429946500dnglr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_602956414ef68.pdfIn PDF document text
    • http://keto-menu.online/confederation_of_british_industry_annual_report_2018z8ma8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461780/normal_5fe1d15620569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_601d8ff12a987.pdfIn PDF document text
    • http://wide-mean.top/uglies_book_sparknotes8e07w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368984/normal_5fe4be1097077.pdfIn PDF document text
    • https://kibolimu.weebly.com/uploads/1/3/4/8/134872751/bapejexatunob.pdfIn PDF document text
    • http://idealicaitalia-official.site/26335256708sw9ax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/fubisamorefasaratogoxilaj.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/96984084291.pdfIn PDF document text
    • http://wuzuruwevirelu.rf.gd/oxford_phonics_world_1_workbook.pdfIn PDF document text
    • http://zazujipediwa.rf.gd/aaja_ve_mahi_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/charity_deduction_tax_reform.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/math_games_for_grade_3_free.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 5352 bytes
SHA-256: 9d22448a8401ef7e67eed7c32a02b20275dd2ff72bc9452950722a221ffd8102
font_01_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 10216 bytes
SHA-256: 557b3968cf752c8951b89394c8dd73df51907eb1f120278f5b95da12f116aa8f