Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2be453a38d4e054…

MALICIOUS

PDF

81.4 KB Created: 2021-03-21 05:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 800cef16a1e51a483cb87025055ff43e SHA-1: 90b1ce57b4925ea29b330500a0d49dbe068480a1 SHA-256: a2be453a38d4e05417871d3bee46059b5a6edc50f3417d60e711062b139df025
76 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a "free-download phishing" lure, directing users to an external URI. The document body itself contains numerous URLs, with the primary malicious URL being https://zajinet.ru/award?keyword=definicion+de+alantoides+pdf. This suggests the document is designed to trick users into downloading potentially malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://zajinet.ru/award?keyword=definicion+de+alantoides+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370068/normal_600914d1e98e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5fc8c78dd23d1.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/dKhdrq2/corynebacterium_treatment_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_603b258af165e.pdfIn PDF document text
    • https://cdn.sqhk.co/xosujopi/jiIpjec/jump_on_meaning_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/68031926307.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/cIs6hbJ/newuwunonafif.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/Osji1mT/30985434321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460954/normal_601fadb567df4.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/que_significan_las_bolitas_del_rosario.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474999/normal_5ffd7f835058d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_604f24f84b72f.pdfIn PDF document text
    • http://kipukosolenures.22web.org/34344265878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_60242592e27e6.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/canzoni_italiane_karaoke.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • https://cdn.sqhk.co/wafepazi/geQ9Nji/body_language_book_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/36jgpPO/skater_boy_lyrics_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_604de505eaf03.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/If6jhgg/63171492268.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/ji2icje/29994040058.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000e4a0.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000e4a0.bin)
    • http://duvowukuvemilo.epizy.com/sharepoint_2010_for_dummies_free_download.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 extracted file (font_00_sfnt_off0000e4a0.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_02_sfnt_off000122d5.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off000122d5.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 5052 bytes
SHA-256: 688c3000cacd515464ecdc3c0380577cb0af8e04188f4138dc2f78e79194cb9b
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 14180 bytes
SHA-256: 21efb87680e2b6233ea8d07c2578831a537a5318ccfd3fdaefc30f5cd8483375
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 16200 bytes
SHA-256: 7427c6bc67859b578149a261544bb1535a5c5cc5499c5bcf465df30433ecb59a