Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a18c060a16b9e85…

MALICIOUS

PDF

72.1 KB Created: 2021-03-28 02:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 182c9f03b6319bfe40ab8bd09bf9535e SHA-1: 1024da78e884d06f566cb8c1e25fb10cf504d50e SHA-256: 0a18c060a16b9e855aa720f9dcce4cf59a1cc16a414001316039770a21d4e944
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 PDF files hosted on various domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF structure itself suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/123?utm_term=early+one+morning+recorder+sheet+music
    • https://zageporipemaza.weebly.com/uploads/1/3/4/5/134507549/72613.pdf
    • https://cdn-cms.f-static.net/uploads/4481675/normal_605a2c4ee4f96.pdf
    • https://cdn-cms.f-static.net/uploads/4425759/normal_603f996c451c8.pdf
    • http://vataponuxizeliz.mywebcommunity.org/fireravega.pdf
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/nexesabujukapuliwik.pdf
    • http://zanovekolasin.mywebcommunity.org/guitar_songbook_for_pc_free_download.pdf
    • https://dariwatipizodaf.weebly.com/uploads/1/3/5/3/135323996/866b92.pdf
    • https://cdn-cms.f-static.net/uploads/4484375/normal_6050f95460238.pdf
    • https://valefeka.weebly.com/uploads/1/3/5/3/135345526/xapenokafuwegapofupi.pdf
    • https://rixonusoraj.weebly.com/uploads/1/3/0/7/130738646/277ef4060b065ef.pdf
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/a555aeaa74f22.pdf
    • https://cdn-cms.f-static.net/uploads/4470982/normal_6046960d1ab34.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/68fd9d70-73cd-45f7-b0fc-b6899149c71d/wordly_wise_3000_book_3_lesson_12.pdf
    • https://uploads.strikinglycdn.com/files/19dc37d5-f4d2-408b-b1c7-8ffc7d77037d/lobupewujoxisosuzosidok.pdf
    • https://uploads.strikinglycdn.com/files/4b1fe7b3-afc7-400c-97ff-db7d283b6c39/vedepevem.pdf
    • https://uploads.strikinglycdn.com/files/c1ebb224-d7a0-4960-b325-497d9e5fb7fc/leather_furniture_interior_design_ideas.pdf
    • https://uploads.strikinglycdn.com/files/43855407-1462-4b83-ab08-a1f052d8d818/92300069977.pdf
    • http://wotidupodugi.myartsonline.com/how_do_you_split_user_stories_in_agile.pdf
    • https://uploads.strikinglycdn.com/files/b9f9cff9-bed9-4689-8450-ab97f3edf31c/process_flow_chart_software_free_download.pdf
    • https://uploads.strikinglycdn.com/files/5e7f9836-cb2c-4dbb-8ada-1775a43b50ae/77932502055.pdf
    • https://uploads.strikinglycdn.com/files/6f79df99-9f70-4964-8d4b-23b295afd174/zubesu.pdf
    • https://uploads.strikinglycdn.com/files/b88f10ef-d12b-418d-b915-196038710594/pubixopefirigilij.pdf
    • http://nivuzujanux.myartsonline.com/jatomukakepovij.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_off0000dba4.bin
2d2da418050ca124c3d74557a737ea7d30e5e1c66676a7aba3e86b971ada3f53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 5412 bytes
font_01_sfnt_off0000edeb.bin
f59ef0fac1f5ee1f6f352605eaa3adfbde3ffa1d4eacb16f3ed3252d79e6997d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 10948 bytes

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