Malicious PDF — malware analysis report

Static analysis result for SHA-256 0818652dc63cdb5e…

MALICIOUS

PDF

102.9 KB Created: 2021-03-20 15:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 151d4d75b475967352842a6f03d2be68 SHA-1: 7ac47e681ad0ccdfc5e638ea8d74c4a1d7d886a2 SHA-256: 0818652dc63cdb5ee23d614d004375f33f82404ca04554b49b77c48a566f8d8a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://zajinet.ru/strik?utm_term=as+bill+sees+it+page+43
    • https://basalolevezuw.weebly.com/uploads/1/3/1/6/131606508/suwuwigimifavim.pdf
    • https://mexasazage.weebly.com/uploads/1/3/4/5/134513067/kebali.pdf
    • https://lowutifita.weebly.com/uploads/1/3/4/3/134352456/f9278f2.pdf
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/f9dbf819c6.pdf
    • https://nesajejegumexe.weebly.com/uploads/1/3/0/7/130776687/sivusuxededol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_cf5d59ca65ab4dda9aebabbab2e9c43b.pdf?index=true
    • https://s3.amazonaws.com/zizene/sukugujilejo.pdf
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_5c1a4a979a6e4844bf2b4ac2354cc037.pdf?index=true
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_b9cb1bccd9624497a6266080177ba955.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_12dd6f77b02b49e0bc8880dee6c923a0.pdf?index=true
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_069a262857c14418b2baf99f935b1522.pdf?index=true
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_73261061420a4b7fb56e6c00f00e40c0.pdf?index=true
    • https://s3.amazonaws.com/vinejivunitego/discover_how_machine_learning_algorithms_work.pdf
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_797dc8dc5acf42438bfa7a6b9a57a10b.pdf?index=true
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_294b6b6e684b4703b81b6411876c8048.pdf?index=true
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_0a494078b3fc4c719c4220783cac6bed.pdf?index=true
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_1b7a2a00ba67406f803ecdc303ca5b1f.pdf?index=true
    • https://s3.amazonaws.com/resisuna/19521553418.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_off00014ba1.bin
ae3bba54e2e73ee63a11cde56ca6947ebbfe2d839325e574270789082b7012c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA1 4844 bytes
font_01_sfnt_off00015c25.bin
aa2c5ac274e3cd76d238961e1e9ad781742e85d5fc9cce0670c702f7b2cbd68a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C25 10768 bytes
font_02_sfnt_off000180d6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180D6 4324 bytes

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