Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2dc4b97e02bf18…

MALICIOUS

PDF

69.5 KB Created: 2021-06-05 11:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c208433d714b3133299cd42a3970eb09 SHA-1: 21f4c9bd6d55090e9cf85eec7a201c66e25136c8 SHA-256: dd2dc4b97e02bf18c7ddab4ccc5ee41544e5338559bd22f2321d120d5be5490a
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which is flagged as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing tactic.

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://crysiq.ru/pbw?utm_term=biology+prefixes+and+suffixes+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459623/normal_60bae4339e2d1.pdfIn PDF document text
    • https://nawamawivawugu.weebly.com/uploads/1/3/1/3/131398148/3130083.pdfIn PDF document text
    • https://durafozo.weebly.com/uploads/1/3/0/7/130740533/bc3ebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483337/normal_6039c6b90628b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufujibumufa.pbworks.com/f/how_to_lose_weight_on_starch_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18db0e3c-8c01-41ec-9420-901b2a08f753/sony_hdr_cx240_as_webcam.pdfIn PDF document text
    • http://sorawako.pbworks.com/w/file/fetch/144462504/bipumazapolurelilawewefi.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/144605025/social_media_marketing_bangla_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34a5fb23-9286-4a4e-8ed1-37886cee635e/57061487524.pdfIn PDF document text
    • http://wenitat.pbworks.com/f/eztec_electronic_talking_naval_battleship_game_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d71cbd74-d824-47ca-aede-86328f492748/xixuzuwudawiviraxovo.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/naruto_shippuden_ultimate_ninja_storm_2_ps4.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/w/file/fetch/144484494/zetesapupufuda.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144550074/granny_outwitt_mod_1.7_3.pdfIn PDF document text
    • http://ludagobef.pbworks.com/f/dotavoputitulorufejimab.pdfIn PDF document text
    • http://xodelow.pbworks.com/f/my_favorite_chaperone_story_elements.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144448803/how_to_control_a_narcissist_book.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/hot_wheels_collectors_guide_2021.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_off0000d401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD401 5676 bytes
SHA-256: 888e3f9ab8b74c09eb6cc4933c40cd3522c987c6840809f216c3a0d42f3c706f
font_01_sfnt_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 9816 bytes
SHA-256: 665ae42642f3c766750914e27426c182b01d5ff8368d050f4ffc25a5a54a1519

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