Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76a8a4ae2dd0a91…

MALICIOUS

PDF

76.0 KB Created: 2021-06-02 17:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cb2c20c7458ca3d8819e74ba5a6fa0d4 SHA-1: ede2811d66953770cbac3c6ee988ef89da2d0840 SHA-256: f76a8a4ae2dd0a91f64041ecd5a65c25ffe943ffced17cdb64795e2f774e6bee
156 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is part of a link farm and has been flagged as malicious by ML classifiers and ClamAV. It embeds an external URI pointing to 'pelibifir.ru', which is likely the malicious destination. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect users to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://pelibifir.ru/123?utm_term=aashiqui+2+all+music+song PDF link annotation
    • https://tadadali.weebly.com/uploads/1/3/4/0/134095934/lusajolakamegur.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/a76cf.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/e2e994a5-823d-48b7-a0f8-e7930503d09b/84596197622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f869faf5-9be6-426c-b363-852e744bce1d/carpentry_and_building_construction_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d376f2-3dfe-4f58-b8f2-85def5d2c8b3/25898526936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e32d1d-9fe7-46bf-b77c-cbab43556656/fasebolaxovimitalet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2afb294a-c04d-4f78-b6ed-7f044c45e375/why_does_my_honda_odyssey_shake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab072dad-6626-4d25-a991-898a71708e6a/zapoxubumadewozoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577606dd-b5f0-49d9-9757-e6a3dc33347c/christian_d_larson_optimist_creed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/427eb5da-92a6-460a-b3bf-e70dec4af0e8/how_to_remove_a_faucet_aerator_without_a_wrench.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/388143d2-5bbc-4b9e-96ad-c12c53bd1ef1/nabemalunetavad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306bf745-5a2d-4d0e-8bc2-b13b410b3c0a/xazazonilosuxod.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144486831/holt_mcdougal_biology_study_guide_a_section_1_manipulating_dna.pdfIn PDF document text
    • http://pijipusap.pbworks.com/f/xafetakiwerek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80432f98-4bc5-41b5-8b5b-8e81738c9e49/guwetum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc553909-5b4e-4546-ad17-7d5d008c3a98/what_were_the_twins_in_miss_peregrine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9937c8-fe0a-46e8-8fa1-f456a890be4f/how_to_reset_limit_switch_on_goodman_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf1fea7b-9073-482f-8e22-1af2d66492a3/15281110189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2150be46-6f92-4e97-bd0f-53e48ea8fa15/80367036332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7de960-1e8a-4575-ba71-fd35d6bd0b3f/benamej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea99f2fb-0586-417e-ba29-9fdc235a2eb5/91679534274.pdfIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144454353/oxford_english_for_cambridge_primary_3_free_download.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144440085/zogezadegawodipujudev.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_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 5364 bytes
SHA-256: 7cc6cab2e749511af4fbc48b81291487364ab197ffbb22ae26898846de62e43c
font_01_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 11124 bytes
SHA-256: 3957d419cfceee47e75ba9e106dd5493498c41ca343681acad1ab8218a8ac5f5