Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcfdc97e982f776…

MALICIOUS

PDF

83.7 KB Created: 2021-05-06 10:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 283a5072d85742492b8e941ffca20bb7 SHA-1: cc7451a14ceca39ffde4ce1bb7a6d39d3beaf30d SHA-256: 5bcfdc97e982f776ac5040ea62ae535af0e55e3823dc2b6325c5f8da7cb7d253
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 0.9990

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=lowrance+elite+4+hdi+ice+fishing+settings PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469831/normal_5ff960602726b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_600fddad00953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_602afed83f904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500187/normal_605c534dd4dd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_606d46dec543c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489599/normal_605f55c119698.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5ff61d7556240.pdfIn PDF document text
    • http://reduslim-buy.site/how_to_learn_chinese_charactersxzts8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_600c569a5d7e0.pdfIn PDF document text
    • http://storeyou.store/liquid_chromatography_experiment_10_pre_lab_answers18153.pdfIn PDF document text
    • http://good-production20.site/how_do_you_perform_salat_al_istikharahyopt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392470/normal_6001525d6c31f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_6054305a87eb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_d488ff99a68c4433aee63fbe0bfdd797.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_d1a41af57be94c7cb08cd40e5c3bea6e.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_3449d169e82c487c9ae17b874150856f.pdf?index=trueIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_656c4b91ac694fc1ac400bff8e79f5be.pdf?index=trueIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_82413736f40b4070982cf377e1e5e44e.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_499cd828160f487a8c6bc652e7f0156b.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_ff27d243678c46d9b376ac610834cc9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvazi/spss_amos_24_full_crack.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_d501151a3a9d46ecbc2fdf8a23389347.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawe/wavepad_audio_editor_for_android.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_26b71ce037194d758e3acff86e907f28.pdf?index=trueIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_77edfe74ada84059827733baf95a8f8c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 5192 bytes
SHA-256: e303b34e4e0c750a6b9fa51003250690d195445fd5d3f84be7f8be30d6ecfeda
font_01_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 11876 bytes
SHA-256: adf2cf2501dc22f87009175108d74cbc7dda4d5d1ffdc05cbba52d0bd12c4048
font_02_sfnt_off0001331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333