Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd96f387d21d99f…

MALICIOUS

PDF

76.6 KB Created: 2021-06-01 22:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1f902fed38a7cd60ae0507458119fb69 SHA-1: d6d79b88b2ca5075c671b992a8592551458d788c SHA-256: cdd96f387d21d99f8ff3ea7c92b105410da009f812e25484640e01f52b569543
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, suggesting it functions as a link farm, potentially for phishing or distributing further malware. The primary external URL observed is https://seumenha.ru/123?utm_term=hogwarts+acceptance+letter+template+pdf, which is disguised as a Hogwarts acceptance letter template.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://seumenha.ru/123?utm_term=hogwarts+acceptance+letter+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393637/normal_605bcac4e8075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472208/normal_5ff3841c6a660.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408703/normal_60b065fedd7e4.pdfIn PDF document text
    • https://kadogejajufa.weebly.com/uploads/1/3/4/7/134717900/xukiwemijabapa_pupojubodu_banesaneninewun.pdfIn PDF document text
    • https://gupamawuma.weebly.com/uploads/1/3/4/6/134602371/a982bf348.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4478667/normal_60b38c87edb7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410462/normal_5fec93b209d38.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/5485240.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/75517.pdfIn PDF document text
    • https://zarogamotelim.weebly.com/uploads/1/3/4/3/134344532/bewonon.pdfIn PDF document text
    • https://vuxabodunufa.weebly.com/uploads/1/3/1/4/131407539/sarudizipomaxivemef.pdfIn PDF document text
    • https://gemigefe.weebly.com/uploads/1/3/4/6/134602098/faa2e8.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/54c03b24-c09a-49cc-bdde-02c9951e8ad7/45228220157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cf7684-1b56-4e7d-8533-1fcee288a34c/336608899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a682858b-73a6-4955-8b81-e7e7ff9efd19/96396436706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d53bfb-851b-4e24-8a68-23c18228ca85/surah_mulk_with_urdu_translation_by_qari_obaid_ur_rehman_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf55557d-ced4-49ea-80fa-7c88f674631c/32745164889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb05b4bf-f1a2-49d9-9a18-757c40a5d35b/dantes_inferno_room_beetlejuice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52429265-cbb1-4c2c-b61e-218621ffe4d3/how_to_use_discord_server_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2f9092-b429-4b1b-9905-c3797c13cd94/why_would_my_water_softener_full_of_water.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_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 5528 bytes
SHA-256: e47da9430e091ec0f7b56d2c55a87cbd19650246a176ef38d0a79fa8c4f7813e
font_01_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 11248 bytes
SHA-256: c55d7bca5b470933a17899292e661f1fef7f8b41094edbbe34bf67fc9cc7be79