Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c40471aa014167…

MALICIOUS

PDF

75.0 KB Created: 2021-02-23 03:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cfa3f74845dc02197a70a234eb805f69 SHA-1: 7d58b1d632b9dfccb7b6ee66f73612cfe3f15748 SHA-256: 21c40471aa0141678792222d9790e51d940df403ae023100e1c64a41e6d02ffb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ML classifier strongly indicates maliciousness. The primary purpose appears to be directing users to a multitude of other PDF documents hosted on disposable domains, potentially for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://baarspo.ru/aws?utm_term=how+to+find+a+new+york+apartment PDF link annotation
    • http://kigurumi.org/canon_mx922_manualcy8ot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417806/normal_60112d0e33b2d.pdfIn PDF document text
    • https://sebumeganajili.weebly.com/uploads/1/3/0/8/130874272/0213495eae1a8.pdfIn PDF document text
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/tozurigisojimiloxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_6022a17a38400.pdfIn PDF document text
    • https://tupipano.weebly.com/uploads/1/3/4/5/134598946/7459562.pdfIn PDF document text
    • http://makipoduzoru.22web.org/budirabefunep.pdfIn PDF document text
    • https://dazuzoboda.weebly.com/uploads/1/3/4/0/134017564/jatunos.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/fepixunipurizinupafe.pdfIn PDF document text
    • http://mon-fortuneo.best/lifegixovaxasituvonuxatuvciltm.pdfIn PDF document text
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/mulazumaga.pdfIn PDF document text
    • https://supeneti.weebly.com/uploads/1/3/2/8/132815050/7b7d77b26.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/5389738.pdfIn PDF document text
    • http://closemaze.com/51075100393g6rgg.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/pedagogy_urdu_book2w6tu.pdfIn PDF document text
    • http://xugixejale.22web.org/android_go_rom_for_redmi_5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469630/normal_601f1bd229e0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/kakuruwaxamumesomukut.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/hashcat_guide_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/78905682457.pdfIn PDF document text
    • http://tafoboverel.epizy.com/cranial_nerve_examination_proforma.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/sample_reference_page_apa_format_websites.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_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 5196 bytes
SHA-256: c7226c90a05d08d52624f9506206da2661b7d3bcddcd6f5880fe24ab0df65e38
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 11036 bytes
SHA-256: 7ce3298ac07aaff7c7c255adf127dafc384f26be8dfd5914ad628116ff2f42a3

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