Malicious PDF — malware analysis report

Static analysis result for SHA-256 51aa84762f2200aa…

MALICIOUS

PDF

72.5 KB Created: 2021-06-01 12:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1eb5647043df49f24dabefbc1acea55 SHA-1: 2f2b24518307e601de5c88260b88dbe3c21e449e SHA-256: 51aa84762f2200aa95bfa405801ba2e2f32ba0e93c034ed0052598f53fb3f734
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/pbw?utm_term=guia+de+antimicrobianos+napoleon+gonzalez
    • https://kuruxodevudule.weebly.com/uploads/1/3/4/7/134728431/nowaf-ximubogafozeje-gegoze-nafebutekabunes.pdf
    • https://pebabozepevi.weebly.com/uploads/1/3/5/9/135966679/xolupukidekef-mafesi.pdf
    • https://xexezakofiwojuv.weebly.com/uploads/1/3/4/3/134372147/rugokor.pdf
    • https://xevavudexatowud.weebly.com/uploads/1/3/4/4/134401026/3844807.pdf
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/4748329f650e9a.pdf
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/vebesefadun_siletalazal_vadevitu_wogafipar.pdf
    • https://xuxuroxipekawip.weebly.com/uploads/1/3/4/2/134265976/8e3eea.pdf
    • https://mikazeral.weebly.com/uploads/1/3/2/3/132303371/a0f338477db5ec5.pdf
    • https://vimavopama.weebly.com/uploads/1/3/4/7/134769365/tivagatijof_pusanevime_gowated.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6b2ac944-3b83-4906-a86b-7da79c56f140/the_last_stand_2_unblocked_weebly.pdf
    • https://uploads.strikinglycdn.com/files/2824a5d0-2c5a-45b6-aeea-6d9108b63aa7/kulefutoxogazudukim.pdf
    • https://uploads.strikinglycdn.com/files/e7b11893-7e1d-4a06-ba6b-dcd5f5cd5e6e/87310409750.pdf
    • https://uploads.strikinglycdn.com/files/774402f3-b0a2-425b-801c-ae1f85c7bc6f/kotesumivafek.pdf
    • https://uploads.strikinglycdn.com/files/9c33779f-f5f8-4cf7-8aac-7de318970b19/kubota_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/a731274f-cb7d-4f57-b4ad-65a5ddcc9992/vocabulary_activity_6th_grade.pdf
    • http://wojipag.pbworks.com/w/file/fetch/144421173/ms_dhoni_full_movie_download_in_tamil_hd.pdf
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144412134/99793606974.pdf
    • https://uploads.strikinglycdn.com/files/3ad1ef29-5c55-4780-8b2a-e01eb67b5760/jugavujubanututakam.pdf
    • https://uploads.strikinglycdn.com/files/f1ac1516-0312-48fa-91ff-413cb7e2f702/motivational_interviewing_techniques_meaning.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_off0000dcbe.bin
95089ac46927b7afc53f9ea77fe8607519a8f657b1d1418f34a51d38e779f077		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 5612 bytes
font_01_sfnt_off0000efc4.bin
a4cb1cb7c66eb566771646a9726586cd8c97885e0504a9f9c9e2e510a51b8dad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 11256 bytes

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