Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd283b8bd26d739e…

MALICIOUS

PDF

114.0 KB Created: 2021-03-02 22:11:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d8614d6689667ce4424647baa2ade583 SHA-1: a4a0cd57168a3c052e08876bffe13992dce30506 SHA-256: dd283b8bd26d739e125ce285e5dcf4be851337918b4bf722c5749bd65820e0af
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common tactic to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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
  • 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://leonvi.ru/123?utm_term=korg+d1600+manual PDF link annotation
    • http://atomyimperial.ru/pokemon_fire_red_download_gba_free4d0m9.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/pj7hhtM/23705475371.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/dasidoxubexeno.pdfIn PDF document text
    • http://profaudit32.ru/intermediate_algebra_college_booki6dl9.pdfIn PDF document text
    • https://penotogales.weebly.com/uploads/1/3/1/4/131438478/zoborefadaluvib.pdfIn PDF document text
    • https://bejeselujolir.weebly.com/uploads/1/3/1/3/131379719/8050863.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/4jiOigM/zomezisomineledi.pdfIn PDF document text
    • http://baranaydin.org/dell_optiplex_780_drivers_for_win_7oq1db.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/fjjidii/wuluke.pdfIn PDF document text
    • https://remofixar.weebly.com/uploads/1/3/0/7/130776049/878c9.pdfIn PDF document text
    • http://sodamasagu.66ghz.com/dictionary_use_practice_worksheets.pdfIn PDF document text
    • http://deflecfcvy.best/basic_project_management_powerpointkma7s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watenumedar.rf.gd/what_are_five_books_of_torah.pdfIn PDF document text
    • http://gasigigi.rf.gd/informal_letter_writing_format_for_class_7.pdfIn PDF document text
    • http://davutawopoban.epizy.com/bronchiolitis_in_infants.pdfIn PDF document text
    • http://musovulazapa.epizy.com/chase_crossword_clue_answer.pdfIn PDF document text
    • http://kewetanetoza.atwebpages.com/where_are_ozeri_scales_made.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/rufuri.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/50563902580.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_off000184f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184F9 5284 bytes
SHA-256: 811332a589b0fb4c6993c95e1d2bb764b11a7b021b36cbd0c54ce07276c8daab
font_01_sfnt_off000196e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196E5 10584 bytes
SHA-256: fd50a6c0942397253fbb6274fe06e6f4345a65ead5038e6d20b07fc283d08ba7

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