Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc150e74fd7459d…

MALICIOUS

PDF

113.2 KB Created: 2021-03-16 19:25:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 10b5a62d0b9a12e4887375b8f72d72e4 SHA-1: a477633a21da5831ccc5de0ef3b8f713a496a873 SHA-256: dbc150e74fd7459d446d5e8a1d9b167f576b25fdd5aed7b73a5f1c9fb1e913ff
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 0.9988

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://leonvi.ru/award?keyword=adb+commands+list+for+android+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428335/normal_5ff010c82d63f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5ffe5343eeee9.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/89837674984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_60417df385c17.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/history_book_big_ideas_simply_explained.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5fc81a36b20f5.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/99019290617.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/764b1735-7999-4d78-938e-344abf8e8ed9/tipos_de_planos_electricos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf9b4e5-82c1-4a5b-80b3-568d11224b32/73118224377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83a230d-fe21-44a6-8098-7bee0738008f/garosalaj.pdfIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_a37598866f034188b6fe9fd9b0952726.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_a7ea75a6fb36440497e83d4c6d3d00d9.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_c85bf54e2f7d4786b71c22e058aca17c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75aec25-070b-4f5d-87bb-ca452c89b6ce/is_organic_chemistry_harder_than_inorganic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3855d3-3a3c-4ac6-bfe7-2a79c9a4f645/how_to_thread_singer_fashion_mate_237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090a2fa4-812e-4a09-b729-865c875bba61/how_to_empty_ativa_paper_shredder.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_fe0afaf5eb7a42e7ab1d520c5e02c4c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bdbfa0a-432c-4c5e-a70e-25ee06cc3443/what_are_the_4_steps_of_computational_thinking.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_d076daf91a4b4e35b8ed1a35a08d8f44.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_45bab87820f84634b7383f78bddad1d7.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_2c5651620b6a4059b8f098a4553b6f53.pdf?index=trueIn PDF document text
    • http://wuwedilejom.myartsonline.com/difiwosegeniputunu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EFC 3124 bytes
SHA-256: 425da1d280eaf8d139ad692d054b112027918052aacc6fabc74acd25c7c648c8
font_01_sfnt_off00017a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A0A 5432 bytes
SHA-256: a07c1da8d4980f33a21c189d5afe27b5cacfe2e8e7f1b938dc3c7b9e96289c20
font_02_sfnt_off00018c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C62 11812 bytes
SHA-256: 26d2305e1ea2973f819f82f8b19a56318e37e453b0fec009712d984bfa3e19f4