Malicious PDF — malware analysis report

Static analysis result for SHA-256 5631275332fe45a7…

MALICIOUS

PDF

66.1 KB Created: 2021-04-06 22:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40be9524ec5bcaca1f499be3223f357a SHA-1: 16e472d096cc94c94c3ec31c55234362737c9fcb SHA-256: 5631275332fe45a7375ab9e25882395d29b46d46cca6fc2ff4afa0a10a412302
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The primary malicious URL identified is https://jacksth.ru/strik?utm_term=is+rosemary%2527s+baby+good, which is likely used to redirect users to a malicious site.

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://jacksth.ru/strik?utm_term=is+rosemary%2527s+baby+good
    • http://ruwufuwetoj.mygamesonline.org/cancer_de_tiroides_clasificacion.pdf
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/44a8535f2.pdf
    • http://tujukesabegakom.mygamesonline.org/16835055195.pdf
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/78743.pdf
    • https://gedexezesojefib.weebly.com/uploads/1/3/4/6/134666283/6574949.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_d2369b07752d417d991d6712d44bffdb.pdf?index=true
    • http://xifenarubomes.rf.gd/las_bienaventuranzas_para_nios.pdf
    • http://fukorow.epizy.com/programming_pearls_download.pdf
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_3260c76ebab54da1aa13b02febf1005d.pdf?index=true
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_8db2bf9068614edf894223e338a652bf.pdf?index=true
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_2ba8edb91d1b4a8da85c1a53d5e61612.pdf?index=true
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_cc25419389194f4abb2b53bb81ad49f9.pdf?index=true
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_77bd5e901ab9443fa9104368d46798bd.pdf?index=true
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_76d59b1d17864698b64bae97dd135904.pdf?index=true
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_046ec44aea6c4e2180aa884855c37f18.pdf?index=true
    • http://xuwewajefifa.rf.gd/is_there_going_to_be_a_harry_potter_movie_in_2020.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_off0000c532.bin
7ebc03769806090272a2ad665fc167d89d912e1fc24c4c787a04547423cfbb36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 5324 bytes
font_01_sfnt_off0000d73c.bin
c00ef07b01069333aa89be01c1cf01d02628a7b556053e72e76c8c294b670be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 9980 bytes

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