Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e80ff0888c922e…

MALICIOUS

PDF

84.7 KB Created: 2021-03-18 10:17:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ae176c04ab23919e938837884c54b64 SHA-1: 7e97f02e845eb64b661803743e89ade61c1649fb SHA-256: 84e80ff0888c922eaa486deb121448b0966d7436e6a03a9eba9e5b4e9d9df0bf
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 of which point to PDF files hosted on various platforms, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=data+sufficiency+answer+choices
    • https://fimozovaxevaba.weebly.com/uploads/1/3/4/3/134366914/83bfc39496ab.pdf
    • https://bojijoda.weebly.com/uploads/1/3/5/3/135325587/wajexisan.pdf
    • http://jajuviramigawo.medianewsonline.com/scratch_tutorial_platformer_game.pdf
    • https://nimawotamuxagop.weebly.com/uploads/1/3/1/6/131606149/vewifevesa.pdf
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/b1cb0.pdf
    • https://semetipakes.weebly.com/uploads/1/3/0/7/130775831/0e5b199c5b0e.pdf
    • https://xewezepi.weebly.com/uploads/1/3/0/8/130813550/e50d3029.pdf
    • http://luxasireku.sportsontheweb.net/vanoditobitutuza.pdf
    • http://mowefopovog.mywebcommunity.org/13313929719.pdf
    • https://bakusiluvusefe.weebly.com/uploads/1/3/5/3/135309983/nezediwuseborifat.pdf
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/mibotanolavi_tinadizi.pdf
    • http://birixuxewazotaz.mywebcommunity.org/sports_news_2020_download.pdf
    • https://favexolifuluk.weebly.com/uploads/1/3/6/0/136092880/matugapuxolorig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_d2d661b1048c4952894f1d2a92d32eae.pdf?index=true
    • https://s3.amazonaws.com/xopugup/latest_android_phones_under_8000.pdf
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_8ff48420d25b417b948ae7cd5bc8defd.pdf?index=true
    • http://buzanuziti.myartsonline.com/excel_2013_update_download_32_bit_with_crack.pdf
    • https://s3.amazonaws.com/pukiza/king_james_bible_catholic_answers.pdf
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_bfad70144d1447a39f093d72c79d459f.pdf?index=true
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_0e339445194e4c8ba9b8cf1b0fdacb27.pdf?index=true
    • https://s3.amazonaws.com/fuzafuzeruwit/what_tools_can_be_used_to_analyse_data.pdf
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_93eef48e450b454c81dd746889a1648b.pdf?index=true
    • 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_off00010c09.bin
2e0dfe0a3167fd039b05600e92ed5ab760389fa71cc84e6f257efbce830b7429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 5132 bytes
font_01_sfnt_off00011d98.bin
92e26852fc15296025bf44b0f8d6ae452c4998f2244835813a524dfa77b9a1f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 11840 bytes

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