Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71090c6ffda1a55…

MALICIOUS

PDF

75.0 KB Created: 2021-03-17 08:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c98aed85651cdd590192228d9e713a89 SHA-1: 0e2ae5736b6b0bc2bbef2a75c9d5d0a3c42a0c6f SHA-256: c71090c6ffda1a5592079377a63ffdab0238fde0e759e608c1aa54fe8a75c5bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://golowaki.ru/wix?keyword=marvel+puzzle+quest+apk PDF link annotation
    • http://shopsmmv.site/229070462302yd0y.pdfIn PDF document text
    • http://pekefosijemibi.sportsontheweb.net/mamozes.pdfIn PDF document text
    • http://menbp.online/rubagevilaxajajivazinh5b.pdfIn PDF document text
    • http://wusejopajaxus.22web.org/zuzunuzilowizi.pdfIn PDF document text
    • http://tamakar.xyz/in_ice_cold_blood_episode_guidet0ime.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/calidad_total_y_productividad_libro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/king_james_song_of_solomon_3.pdfIn PDF document text
    • http://mujedofagogi.epizy.com/rekudezotodazenakotaro.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/how_to_write_a_geometric_series_in_summation_notation.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/what_is_the_meaning_of_buffalo_animal.pdfIn PDF document text
    • http://xifabemifuxiza.rf.gd/ayyubids_mamluks_and_crusaders.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/kemiwujiroxen.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/osprey_atmos_65_user_guide.pdfIn PDF document text
    • http://pinezininefos.epizy.com/ford_555c_backhoe_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/295b16cf-0f0a-424c-a79d-86258f0b0ead/sdlc_life_cycle_in_software_testing_guru99.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a46648-5ec9-46e3-aa0c-579b1e24f590/hp_photosmart_7510_ink_cartridge.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_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 5116 bytes
SHA-256: 031d8c4a62b8702ec034bdfa5f90e37898a925d590105325a5511c7ee5edd1a0
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 10752 bytes
SHA-256: f5cfe284f9b6c1bcfb2b02a078cec87c52d9606997394e6cebd59865a7f587e6