Malicious PDF — malware analysis report

Static analysis result for SHA-256 43335be23e556b1c…

MALICIOUS

PDF

78.1 KB Created: 2021-05-03 23:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad549f81ddc8d1afb44c19ea405b64ac SHA-1: 9c8b409551d961dba8d7f5436f3d764dc9f4f9b7 SHA-256: 43335be23e556b1cac05be67d4d8794bc622db3eae29fcba860147d1837b992a
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-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://crophysi.ru/strik?utm_term=learn+everything+about+stock+market+india PDF link annotation
    • http://openlait.pro/report_dangerous_driving_nsw_online7z1ar.pdfIn PDF document text
    • http://ontrade.top/jesabuwadabez2wmn.pdfIn PDF document text
    • http://filanion.online/why_is_my_ipad_keyboard_case_not_workingm87t9.pdfIn PDF document text
    • http://itdomen.fun/importance_of_being_earnest_summaryttpeg.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.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/37e414e4-daa2-4970-8e8b-47a8063ea3c1/spring_framework_tutorial_java_brains.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/21213076543.pdfIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_61aec85cbe1643fbb25defc508d76829.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijudow/jipebakuvodasiganube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58251859-c069-4630-86a8-69622981f1ce/lincoln_225_arc_welder_wiring_diagram.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_cd5f7158020a4cf2b670c73b118f25d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/754a5f84-9868-458f-bcc4-61d86d644bb9/terra_cotta_fragment_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bed0f5f-bd47-440c-a5cd-d9ac3e07e02f/ernest_hemingway_son_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9101718-0e1b-484f-bce9-2e86f929840f/will_cyberpunk_2077_have_mods.pdfIn PDF document text
    • https://1e2e1d2f-e5bc-406e-8ade-c93a3c5db6fe.filesusr.com/ugd/81c7be_3f40f24067c94ba49a8ceb63b22d0f00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/papier_vente_vehicule.pdfIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_289af8645c054656ba6816096a76c0b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48218be4-56cf-4eca-8de0-95509a2d9f10/warframe_wii_u_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6353db-82f3-4394-8d08-10327775316c/the_game_cast_members.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/rutovelabowiliwemoruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b40828-201f-4e8c-9d92-3eade6909888/javukozaw.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_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 5628 bytes
SHA-256: df46b97e757d35597c16c65b9660d2d319346636f9dcae09f0efda1833971e8b
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 10472 bytes
SHA-256: 520d973f341a29457b0b256fc6cce2e0bdd789454aa3713bb6a45af118adb31f