Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fd5f001f462526…

MALICIOUS

PDF

81.3 KB Created: 2021-03-14 03:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 936bc18deaa502a491e37d80fee46866 SHA-1: 73a6c9a1c2cccc2e66889d25ed1d0866575f5a53 SHA-256: 29fd5f001f4625265ccc23c97875f9281238cc04b9baaf4b2d92183aa238671c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate this is a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious campaign.

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://druttle.ru/wix?keyword=codehs+card+classes+answers
    • http://4338bacchus.com/crc_card_templatehanji.pdf
    • https://gigerexug.weebly.com/uploads/1/3/5/3/135341911/7683554.pdf
    • https://jidamusalaf.weebly.com/uploads/1/3/4/3/134378250/jolan-puwixegi.pdf
    • http://foxinawolukomat.iblogger.org/o_que_significa_uniformemente_dicionario.pdf
    • http://vofidiporalives.22web.org/aiims_rishikesh_recruitment.pdf
    • https://zotadapavera.weebly.com/uploads/1/3/4/4/134483721/jopuko.pdf
    • http://zarabotok.space/60535423407y5ugb.pdf
    • http://jibiduseg.22web.org/63368161775.pdf
    • https://tikefukexizuse.weebly.com/uploads/1/3/4/8/134879623/bunopiv-nejibiwijawuxim.pdf
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/ronuk.pdf
    • http://marketop.club/nujozikuvugidiw8gpz8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_d61338af545248849b86f3beba20cf6a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f3af73b-e6ca-4cc8-b087-fdb4eafedc00/19825909149.pdf
    • http://najaxobefirag.epizy.com/instagram_story_template_adobe_premiere.pdf
    • https://s3.amazonaws.com/pojikovewijeja/47304901088.pdf
    • https://e424a478-4e79-4952-a11a-519574c743a8.filesusr.com/ugd/3bcfef_d92fd060b1cd4c2cbccb61a6670486b0.pdf?index=true
    • http://sidijujaz.epizy.com/99791314309.pdf
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_59fe9224a1964c0a9d109b94a3f9bd53.pdf?index=true
    • https://s3.amazonaws.com/jivamubug/porter-_cable_door_hinge_template_kit_59381.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_ca9e65edacc6420192659cc40d6aa2ca.pdf?index=true
    • https://s3.amazonaws.com/kesumasaka/facebook_status_video_punjabi_song.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_bc4fea241fc5467a848843c6b053d7a6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/abbc9b4e-1830-475f-b85a-b6fecafe6c04/9639325739.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2cf.bin
a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 2900 bytes
font_01_sfnt_off0000fd11.bin
2ce180c0ec25e73f199590ef5551cdb2d089bbb43f9ab15e1ddc44793efdd75e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 5024 bytes
font_02_sfnt_off00010e2b.bin
519e8a77eb391e243c6f3f429760f8cdab4f5e3eb30ebb8367b020e63be39d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 12096 bytes

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