Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a4f396e6eb4899…

MALICIOUS

PDF

73.5 KB Created: 2021-03-18 13:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ba5a783771fc769a3d2ebc69a7bb2791 SHA-1: c0e92de97cf78dfe2377f349932ecd0eeb43a2b5 SHA-256: 43a4f396e6eb48990a98d7aeb60ea41d3c1316c2ce2de21c8cff7be0a265a638
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, with one pointing to 'kuzutuzo.ru' which appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a 'Troy-bilt mower', likely to entice clicks on the malicious links. No scripts were extracted, but the presence of numerous external URIs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=troy-bilt+21+high+wheel+self-propelled+mower PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • http://mscgis.net/nasizotebosemot5s405.pdfIn PDF document text
    • https://cdn.sqhk.co/xumefugafa/AjavNJE/color_maze_amazing_3d_model.pdfIn PDF document text
    • https://cdn.sqhk.co/runolisor/hb0Njj9/60895688827.pdfIn PDF document text
    • http://fastdonwload.space/betosekikatalasure0752q.pdfIn PDF document text
    • http://xepuxupipe.mywebcommunity.org/andy_clark_being_there.pdfIn PDF document text
    • http://whysmall.space/kujunifufebatilajilunikow6ej8.pdfIn PDF document text
    • http://kogowetek.getenjoyment.net/36856546789.pdfIn PDF document text
    • http://setlyb.online/48974571603numae.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/2bjeNji/remokevixopuwusiluxoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_b2c0addcde7a4c58a664aab16b0a3763.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasutiz/guided_tours_south_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/can_a_power_recliner_be_repaired.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_0010c3c6564049488ff529c8d03d265d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/adobe_acrobat_6._0_professional_full_version.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_c9397372b51c464b9f56e1a612a26e29.pdf?index=trueIn PDF document text
    • https://c8f0d892-4c73-447a-841b-b6a48a565a7d.filesusr.com/ugd/928a57_44660c2dd9414f599174b8ea94c6c5d2.pdf?index=trueIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_755569fc3e0548359ccef4bfb868c4aa.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 5744 bytes
SHA-256: 2207a67a47df1399d64f1f61156454b31df288437fd5ece97e9e34dfcc006898
font_01_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 11808 bytes
SHA-256: 8fab98e2c5d3d294bb8dcd00785556b4ab29597544f9fb47ab7eb0aa84b0cac4

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