Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd963f4cc2287aa…

MALICIOUS

PDF

75.5 KB Created: 2021-05-23 01:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 75b8bb7a58ca51948818facc612eb1dd SHA-1: 988f0fbb9534ab3318d1b2ca6c50bd7cd5d8ff54 SHA-256: cdd963f4cc2287aa40654c92df5b020436abc34c945f82dff2c6bfc96400b9d0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=printable+list+of+regular+and+irregular+verbs+in+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457849/normal_60280797eb17e.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/wapigomebarowo.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/1188554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465705/normal_6015c739d309f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423696/normal_60127f8c7aa2e.pdfIn PDF document text
    • https://vojosapixetogal.weebly.com/uploads/1/3/4/7/134770394/a7a899ff5b2b940.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/552253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_5fe8b3c5ee540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5fc96d97e6b6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_5fe398e0d83d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_604cd520088fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_60500fea012f3.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/b329565a-a7de-414f-a109-ba200b52d70a/my_cloud_ex2_ultra_fan_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebe75fd-a2a5-41aa-a2eb-507102422205/xotudixesuke.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/maus_part_2_chapter_5_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16248ce5-9bf4-4874-8256-c4f283a40546/saltwater_fishing_rods_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236d7516-01d8-4df3-86bd-59cf0f8d2651/zuwedebuxofokemug.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/83264360374.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/kenmore_elite_microwave_convection_oven_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/74314248592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4899ab-bdd4-4794-b942-10d452f72956/9_times_tables_worksheet.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_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 5372 bytes
SHA-256: 036fc20af47d5163541de4ca956f86f1598037f760313d3028c57eadddc7fb14
font_01_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 10372 bytes
SHA-256: bf650ed7941d5d524ee3a7b66eb68293999a1c14cb58196a2d541f7388ca9090