Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24f137ef7def2f3…

MALICIOUS

PDF

71.3 KB Created: 2021-06-03 07:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 89c6019c05991814a8a9d279ff826848 SHA-1: 7c82b1395ed0f0f13bf5216d32d4c7677d26c8d3 SHA-256: f24f137ef7def2f395d9f0ba458fb177c7ed52d04bd5e74e1bbeb14c20bac1a9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/pbw?utm_term=electrochemistry+review+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fcf596276dc0.pdfIn PDF document text
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/woraziga.pdfIn PDF document text
    • https://nuwoveforu.weebly.com/uploads/1/3/4/0/134099073/1121580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369520/normal_5fcf10d128df9.pdfIn PDF document text
    • https://mewupigokudupez.weebly.com/uploads/1/3/0/7/130738506/1327581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450427/normal_5fe3dfef503c9.pdfIn PDF document text
    • https://givebuzuwipagin.weebly.com/uploads/1/3/0/7/130775776/jozononepub.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4501995/normal_60afeb176f93f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_60505969b6e89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5fe00daebe2de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_60430e4ad31c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_6019d9782e310.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/rekibafemezenuwir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_60419a17cec0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402963/normal_5ff9e4af2e851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_6062b3cf32765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_6069d8493e8fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1129f5a-5517-4a34-8fda-3f93323c1849/16264224064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01435a1-0379-4429-b34f-a3d95fd11886/satadebozasurapex.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144507498/dakifuwexeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0ee57c-0d96-4aae-a359-1037c0bf27f6/online_tamil_wedding_invitation_maker_free.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/noxoradizudobapaduwew.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/f/45406394626.pdfIn PDF document text
    • http://lokiboz.pbworks.com/f/harry_potter_and_the_cursed_child_bangla.pdfIn PDF document text
    • http://pojaweku.pbworks.com/w/file/fetch/144463980/loxiwunupaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b45bb4a-279c-49c1-9786-fbff9e475afe/ejemplo_de_documento_en_formato_apa_2020.pdfIn 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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 5312 bytes
SHA-256: 68cc56e2e29d27fb9abe39c8bc256e6efee07cdcf5164e4de980e1d9a0df48c2
font_01_sfnt_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 10624 bytes
SHA-256: ac45e004007ece37f9322ea671364433e204ec6e84cb3f571eb641d56ae9a0f7