Malicious PDF — malware analysis report

Static analysis result for SHA-256 251d75c9164df53c…

MALICIOUS

PDF

81.4 KB Created: 2021-05-23 19:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4378ff61e4671850c0c498243f9b012c SHA-1: 7f2f3230ed1704be40038565aadc83b76708ea3c SHA-256: 251d75c9164df53c31fa810a895f2f2baad29cdb287cafb9e3689d78497a89b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various Weebly and other hosting sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content hosted on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/rebubimutiv-wolin-xusisolutexe-zuwisurunu.pdf
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/dulira-vikagunibazaxu-nibitodi.pdf
    • https://cdn-cms.f-static.net/uploads/4416675/normal_606a9dc419f58.pdf
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/zowir_sozijepivanux_letixudipeb_fizejopatekuba.pdf
    • https://cdn-cms.f-static.net/uploads/4369638/normal_60586ad9ef8c4.pdf
    • https://static.s123-cdn-static.com/uploads/4386349/normal_5fe30765a9840.pdf
    • https://zomasaxejis.weebly.com/uploads/1/3/4/3/134325580/romem.pdf
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/4751116.pdf
    • https://static.s123-cdn-static.com/uploads/4479214/normal_600504e8b5fc9.pdf
    • https://cdn-cms.f-static.net/uploads/4380393/normal_6068c8cfbb392.pdf
    • https://static.s123-cdn-static.com/uploads/4486552/normal_6009139146992.pdf
    • https://cdn-cms.f-static.net/uploads/4445326/normal_6063b36b88792.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=vw%20polo%201.4%20tdi%20owners%20manual
    • https://uploads.strikinglycdn.com/files/06d78e2d-2feb-40b2-b3c1-ad02e6d0911e/dr._jekyll_and_mr._hyde_1931_trailer.pdf
    • https://uploads.strikinglycdn.com/files/62ff8876-9501-462d-a58a-e58ba2c7815b/89803271203.pdf
    • https://uploads.strikinglycdn.com/files/94b32893-98b1-46db-94e2-40066ebe7df2/gps_garmin_etrex_30_manual_em_portugus.pdf
    • https://uploads.strikinglycdn.com/files/aef9187b-b211-4db2-8d24-620c308bec8b/97310680963.pdf
    • https://uploads.strikinglycdn.com/files/9b1f41ad-db71-4baf-a25c-1ddd5ce13cc9/83892307328.pdf
    • https://uploads.strikinglycdn.com/files/23cf2a07-d42f-40e4-8345-572f7b434e4b/best_weapon_blueprint_in_dying_light.pdf
    • https://uploads.strikinglycdn.com/files/013eeb6f-c3a1-4155-9092-b4fb5182e532/jumping_spider_eyesight.pdf
    • https://uploads.strikinglycdn.com/files/3c83b430-39e4-4f58-ac88-08da2f6e3ea7/how_do_i_import_a_keynote_into_imovie_on_ipad.pdf
    • https://uploads.strikinglycdn.com/files/be8a13ce-0ebf-4720-bf09-02c7febf8311/54532042740.pdf
    • https://uploads.strikinglycdn.com/files/b2b4eeac-96cb-4788-aad8-302c9e572295/julaxifo.pdf
    • https://uploads.strikinglycdn.com/files/7a970e7c-ef27-455d-a87d-facdeeabef88/age_of_exploration_vocabulary_worksheet_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee6.bin
71b6d1b60ffa1e7b042e2f1aad1693cc91ce704b21b80d640fedac778eb06d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 5332 bytes
font_01_sfnt_off0001110c.bin
7bfa62e738b202f8f01f43e9035455299fdebafd7cb2c9fbb45c25e756cf55e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 11484 bytes

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