Malicious PDF — malware analysis report

Static analysis result for SHA-256 715eb122919821a2…

MALICIOUS

PDF

75.1 KB Created: 2021-04-07 01:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 849b0969d02ac159842fe8c64f30efe0 SHA-1: 050e9fd3bef54ac4c20c2d45af767881179252ea SHA-256: 715eb122919821a296dc5f33ba95675ee9eeb13bc976d12ec2dce9b4e52e7b05
244 Risk Score

Malware Insights

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

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 embedded links, with at least one pointing to a known malicious redirector, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=beps+action+14+pdf In PDF document text
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/8222a750a65efcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_6053072dd8afc.pdfIn PDF document text
    • https://jebezefekoju.weebly.com/uploads/1/3/4/7/134737834/1794123.pdfIn PDF document text
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/kasuko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_6021cd8d9c7ce.pdfIn PDF document text
    • http://lyudi23.ru/how_do_you_qualify_for_michigan_medicaid2ae0k.pdfIn PDF document text
    • http://epaytds.xyz/jorosshe5b.pdfIn PDF document text
    • http://womenit.space/genius_song_lyrics_morewwl2o.pdfIn PDF document text
    • http://fenellalucynelle.info/98283217722qphdq.pdfIn PDF document text
    • http://amandeepsadyora.com/dosawituwiganuxyzg9n.pdfIn PDF document text
    • https://wuvalarovujed.weebly.com/uploads/1/3/4/2/134266489/mosaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_6034960772f29.pdfIn PDF document text
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/powavukikavejokos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57e596f1-a2cf-4e3c-9ba9-dc8e42e7d639.filesusr.com/ugd/1e1da7_27bdee8abbc4452b80e2826f418c17d0.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_7f14bd0536fa4c4e99f52f535300cc8f.pdf?index=trueIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_fc59dcf46d5c4dd1a45b02c80c50931c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegozegi/67660633038.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/papilatedudebujexif.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_c7db37d9c03d44c583186e73250c21b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/31113497332.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/how_fast_is_a_125cc_ssr.pdfIn PDF document text
    • https://67389751-14cc-4ed3-b660-7ef7239e4cc3.filesusr.com/ugd/bb5584_6258b12999984d1ebdb92ce21c08d9f4.pdf?index=trueIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_77211bd7322f4a79bf466b7a45204448.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_e4c706757b9944eaa2686c98a296a3d2.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_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 5212 bytes
SHA-256: 710783afba93e90c18ef2b35661f98b751ef265ecc0cb72e1f90bc6af67593f2
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 10452 bytes
SHA-256: 9bde48326a829a684a57ad98bf863eedf12aa148aecf92fc543ca3b3eecb46ed